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Radiometric Tracking Techniques For Deepspace Navigation Deepspace Communications And Navigation Series 1st Edition Catherine L Thornton
Radiometric Tracking Techniques
for Deep-Space Navigation
Catherine L. Thornton
James S. Border
MONOGRAPH 1
DEEP–SPACE COMMUNICATIONS AND NAVIGATION SERIES
Radiometric Tracking Techniques
for Deep-Space Navigation
DEEP-SPACE COMMUNICATIONS AND NAVIGATION SERIES
Issued by the Deep-Space Communications and Navigation Systems
Center of Excellence
Jet Propulsion Laboratory
California Institute of Technology
Joseph H. Yuen, Editor-in-Chief
Radiometric Tracking Techniques
for Deep-Space Navigation
Catherine L. Thornton
James S. Border
MONOGRAPH 1
DEEP–SPACE COMMUNICATIONS AND NAVIGATION SERIES
Jet Propulsion Laboratory
California Institute of Technology
Radiometric Tracking Techniques for Deep-Space Navigation
(JPL Publication 00-11)
October 2000
The research described in this publication was carried out at the
Jet Propulsion Laboratory, California Institute of Technology,
under a contract with the National Aeronautics and Space Administration.
v
Table of Contents
Foreword ........................................................................................................vii
Preface ............................................................................................................. ix
Acknowledgments ............................................................................................. xi
Chapter 1: Introduction ............................................................................. 1
References ........................................................................................ 2
Chapter 2: Earth-Based Tracking and Navigation Overview ............... 3
2.1 Navigation Process ................................................................. 3
2.2 Reference Frames ................................................................... 5
2.3 Spacecraft Equations of Motion ........................................... 6
References ......................................................................................... 7
Chapter 3: Range and Doppler Tracking Observables ......................... 9
3.1 The Tracking Link .................................................................... 9
3.2 Range and Doppler Information Content .......................... 12
3.3 Tracking Data Error Sources ............................................... 15
3.3.1 Clock Instability ....................................................... 15
3.3.2 Instrumental Effects .................................................. 18
3.3.3 Transmission Media ................................................. 19
3.3.4 Platform Parameters ................................................. 21
3.4 The GPS Calibration and Tracking System ...................... 28
3.5 Range and Doppler System
Measurement Performance ................................................. 32
3.6 Range and Doppler System
Positioning Performance ..................................................... 34
References ....................................................................................... 37
Chapter 4: VLBI Tracking Observables .................................................. 47
4.1 VLBI System Description ..................................................... 47
4.1.1 Delta VLBI ............................................................... 49
4.1.2 Radio Source Reference Frame ................................ 50
vi Table of Contents
4.1.3 Radio and Planetary Frame Tie .................................50
4.1.4 VLBI Calibration System .........................................51
4.1.5 Major Error Sources ..................................................52
4.2 Spacecraft VLBI System Performance ...............................54
4.3 Utility of Open-Loop Recordings ........................................57
References .......................................................................................58
Chapter 5: Future Directions in Radiometric Tracking ........................63
5.1 Doppler and Range ................................................................63
5.2 Very Long Baseline Interferometry ....................................65
5.3 Connected-Element Interferometry ....................................66
5.4 Same-Beam Interferometry ..................................................67
5.5 Spacecraft-to-Spacecraft Tracking .....................................69
References .......................................................................................72
Glossary ........................................................................................................77
Acronyms ......................................................................................................79
vii
Foreword
The Deep Space Communications and Navigation Systems Center of
Excellence (DESCANSO) was recently established for the National Aeronau-
tics and Space Administration (NASA) at the California Institute of Technol-
ogy’s Jet Propulsion Laboratory (JPL). DESCANSO is chartered to harness
and promote excellence and innovation to meet the communications and navi-
gation needs of future deep-space exploration.
DESCANSO’s vision is to achieve continuous communications and precise
navigation—any time, anywhere. In support of that vision, DESCANSO aims
to seek out and advocate new concepts, systems, and technologies; foster key
scientific and technical talents; and sponsor seminars, workshops, and sympo-
sia to facilitate interaction and idea exchange.
The Deep Space Communications and Navigation Series, authored by sci-
entists and engineers with many years of experience in their respective fields,
lays a foundation for innovation by communicating state-of-the-art knowledge
in key technologies. The series also captures fundamental principles and prac-
tices developed during decades of deep-space exploration at JPL. In addition, it
celebrates successes and imparts lessons learned. Finally, the series will serve
to guide a new generation of scientists and engineers.
Joseph H. Yuen
DESCANSO Leader
October 2000
Radiometric Tracking Techniques For Deepspace Navigation Deepspace Communications And Navigation Series 1st Edition Catherine L Thornton
ix
Preface
Radiometric Tracking Techniques for Deep Space Navigation is an intro-
duction to newcomers in this field, a reference to professionals in related
fields, and an exposition of the current state of the art. It focuses on a broad
array of technologies and concepts developed over the last four decades to
support radio navigation of interplanetary spacecraft. The technical terms in
the text assume that the reader is familiar with basic engineering and
mathematical concepts contained in books such as The Electronics of Radio
(D. B. Rutledge, Cambridge University Press, 1999) and Applied Optimal
Estimation (A. Gelb, editor, MIT Press, 1974).
In addition to an overview of Earth-based radio navigation techniques, the
scope of this monograph includes a simplified conceptual presentation of each
radiometric measurement type, its information content, and expected measure-
ment accuracy. More rigorous treatments may be found in the numerous refer-
ences cited. Many of these references pertain to work done at the Jet Propulsion
Laboratory (JPL) as part of the development of the very system that is the topic
of this monograph.
Beyond describing the types of radio measurements that could be made, we
also suggest what measurements should be made under various mission condi-
tions. The methods we describe for both acquiring and calibrating radiometric
measurements provide a robust system to support guidance and navigation for
future robotic space exploration.
We have drawn the content of this monograph from the work of many
JPL colleagues, past and present, in the Tracking Systems and Application
Section and the Navigation and Flight Mechanics Section, who have
participated in the effort to develop and use state-of-the-art radiometric navi-
gation techniques. We are especially indebted to William G. Melbourne for
Other documents randomly have
different content
2. By Relation,
God's children,
1. By Creation: so all are:
and therefore all may
thus far call him
Father.
1. His Own;
2. By Redemption: as all
are as to the sufficient
price and satisfaction.
2. His Subjects;
3. By Regeneration: and
so only the regenerate
are children.
3. His Beloved and
Beneficiaries, that live
upon Him, and to Him,
as to their End.
3. By Quality. 1. Dependent
on God.
Yet 1. Loving
God, as
their Father.
All
which is
signified
in the
word
OUR—
2.
Necessitous.
2. Loving
themselves,
as men.
3. Sinners. 3. Loving
others, as
brethren.
II. The
Prayer, or
Petitions,
in two
parts: of
which,
I. The first
part is
according
to the
order of
estimation,
intention,
and desire;
and is,
1. For the end simply, which is GOD; in the word "THY" repeated in every
petition.
2. For the end
respectively in
the interest of
God, and that is
in
I. The highest or ultimate, that is, the glory of God;
"HALLOWED BE THY NAME."
II. The highest means of his glory, "THY KINGDOM
COME;" that is, let the world be subject to thee their
Creator and Redeemer; the universal King.
III. The next means, being the effect of this: "THY
WILL BE DONE," that is, let thy laws be fulfilled, and
thy disposals submitted to.
3. For the lower end, even the subject of these means; which is the public
good of mankind, the world and church: "IN EARTH," that is, let the
world be subjected to thee, and the church obey thee; which will be the
greatest blessing to them: ourselves being included in the world. And the
measure and pattern is added, "AS IT IS IN HEAVEN," that is, let the
earth be conformed as near as may be to the heavenly pattern. So that
this part of the Lord's Prayer, proceeding in the order of excellency and
intention, directeth us, I. To make God our ultimate, highest end; and to
desire his interest first, and in this order, (1.) His glory, (2.) His kingdom,
(3.) Obedience to his laws. II. To make the public good of the world and
the church our next end, as being the noblest means. III. To include our
own interest in and under this, as the least of all; professing first our own
consent to that which we desire first for others.
II. The
second
part is
according
1. For the support of our nature by necessary means: "GIVE US THIS DAY
OUR DAILY BREAD:" this being God's first gift, presupposed both to grace
and glory. "GIVE," signifieth our dependence on God for all. "US," our
charity, that we desire relief for ourselves and others. "DAILY" (or
to the
order of
execution,
and is for
ourselves,
beginning
at the
lowest, and
ascending,
till the end
first
intended,
be last
attained:
and it is,
substantial) "BREAD," our moderation; that we desire not unnecessaries
or superfluities. "THIS DAY," the constancy of our dependence, and that
we desire not, or care not too much for the future, and promise not
ourselves long life.
2. For clearing us from the guilt of all sin past (repentance and faith being
here presupposed); where is (1.) The Petition: "AND FORGIVE US OUR
DEBTS: (trespasses or sins). (2.) The motive from our qualification for
forgiveness: "AS WE FORGIVE OUR DEBTORS:" without which God will
not forgive us.
3. For future preservation: (1.) From the means, "LEAD US NOT INTO
TEMPTATION:" that is, though thou mayst justly try us, yet pity our
frailty, and neither cause nor permit us so to be tried, as may tempt us to
sin and ruin. (2.) From the end, "BUT DELIVER US FROM THE EVIL:" that
is, 1. The Evil One, Satan (and his instruments). 2. The evil thing: 1. Sin;
2. Misery; which are Satan's end. He that would be saved from hell and
misery, must be saved from sin; and he that would be saved from both,
must be saved from Satan and from temptation. Quest. But where are
the requests for positive holiness, grace, and heaven? Answ. 1.
Repentance and faith are supposed in the petitioner. 2. What he wanteth
is asked in the three petitions of the first part, that we with others may
sanctify God's name, and be the subjects of his kingdom, and do his will,
&c. Christ and a state of grace, are finally in the first petition, formally in
the second, and expressly in the third.
III. The
conclusion:
the reason
and
termination
of our
desires in
their
ultimate
end; here
praised:
beginning
at the
lowest, and
ascending
to the
highest:
containing,
I. What we
praise; or
the matter;
or interest
of God,
1. His universal reign, "FOR THINE IS THE KINGDOM," administered
variously, agreeably to the subjects: all owe this absolute obedience: who
commandest and executest what thou wilt.
2. His own perfections, "THE POWER:" both right and all-sufficiency:
including his omniscience and goodness, as well as omnipotence.
3. His incomprehensible excellency and blessedness, as he is the ultimate
end of us and all things; "AND THE GLORY," Rom. xi. 36; 1 Cor. x. 31.
II. Whom we
praise:
GOD, in the word "THINE:" in him, the first efficient cause of all things,
we begin: his help, as the dirigent cause, we seek: and in him, as the
final cause, we terminate.
III. The
duration.
"FOR EVER AND EVER," to eternity: and "AMEN" is the expression of our
consent. For of Him, and through Him, and to Him are all things: to Him
be glory for ever, Amen, Rom. ix. 36.
So that it is apparent that the method of the Lord's prayer is
circular, partly analytical, and partly synthetical; beginning with God,
and ending in God: beginning with such acknowledgments as are
prerequisite to petition, and ending in those praises which petition
and grace bestowed tend to: beginning our petitions for God's
interest and the public good, according to the order of estimation
and intention, till we come to the mere means, and then beginning
at the lowest, and ascending according to the order of execution. As
the blood passing from the greater to the smaller numerous vessels,
is there received by the like, and repasseth to its fountain; such a
circular method hath mercy and duty, and consequently our desires.
Tit. 2. Some Questions about Prayer answered.
The rest of the general directions about prayer, I think will be best
contrived into the resolving of these following doubts.
Quest. I. Is the Lord's prayer a directory only, or a form of words
to be used by us in prayer?
Answ. 1. It is principally the rule to guide our inward desires, and
outward expressions of them; both for the matter, what we must
desire, and for the order which we must desire first and most. 2. But
this rule is given in a form of words, most apt to express the said
matter and order. 3. And this form may fitly be used in due season
by all, and more necessarily by some. 4. But it was never intended
to be the only words which we must use, no more than the creed is
the only words that we must use to express the doctrine of faith, or
the decalogue the only words to express our duty by.[57]
Quest. II. What need is there of any other words of prayer, if the
Lord's prayer be perfect?
Answ. Because it is only a perfect summary, containing but the
general heads: and it is needful to be more particular in our desires;
for universals exist in particulars; and he that only nameth the
general, and then another and another general, doth remember but
few of the particulars. He that shall say, "I have sinned, and broken
all thy commandments," doth generally confess every sin; but it is
not true repentance, if it be not particular, for this, and that, and the
other sin; at least as to the greater which may be remembered. He
that shall say, "I believe all the word of God, or I believe in God the
Father, Son, and Holy Ghost," may know little what is in the word of
God, or what these generals signify, and therefore our faith must be
more particular. So must desires after grace be particular also:
otherwise it were enough to ask for mercy in the general. If you say,
that God knoweth what those general words signify, though we do
not; I answer, this is the papists' silly argument for Latin prayers,
God knoweth our desires without any expressions or prayers at all,
and he knoweth our wants without our desires. But it followeth not
that prayers or desires are unnecessary. The exercise of our own
repentance and desire doth make us persons fit to receive
forgiveness, and the grace desired; when the impenitent, and those
that desire it not, are unfit. And it is no true repentance, when you
say, "I am sorry that I have sinned," but you know not, or remember
not, wherein you have sinned, nor what your sin is; and so repent
not indeed of any one sin at all. And so it is no true desire, that
reacheth not to the particular, necessary graces, which we must
desire; though I know some few very quick, comprehensive minds
can in a moment think of many particulars, when they use but
general words; and I know that some smaller, less necessary things,
may be generally passed over; and greater matters in a time of
haste, or when we, besides those generals, do also use particular
requests.
Quest. III. Is it lawful to pray in a set form of words?
Answ. Nothing but very great ignorance can make you really doubt
of it.[58] Hath God any where forbid it? You will say, that it is enough
that he hath not commanded it. I answer, that in general he hath
commanded it to all whose edification it tendeth to, when he
commandeth you, that all be done to edification; but he hath given
no particular command, nor prohibition. No more hath he
commanded you to pray in English, French, or Latin; nor to sing
psalms in this tune or that, nor after this or that version or
translation; nor to preach in this method particularly or that; nor
always to preach upon a text; nor to use written notes; nor to
compose a form of words, and learn them, and preach them after
they are composed, with a hundred such like, which are undoubtedly
lawful; yea, and needful to some, though not to others. If you make
up all your prayer of Scripture sentences, this is to pray in a form of
prescribed words, and yet as lawful and fit as any of your own. The
psalms are most of them forms of prayer or praise, which the Spirit
of God indited for the use of the church, and of particular persons. It
would be easy to fill many pages with larger reasonings, and
answers to all the fallacious objections that are brought against this;
but I will not so far weary the reader and myself.
Quest. IV. But are those forms lawful which are prescribed by
others, and not by God?
Answ. Yea; or else it would be unlawful for a child or scholar to
use a form prescribed by his parents or master. And to think that a
thing lawful doth presently become unlawful, because a parent,
master, pastor, or prince doth prescribe it or command it, is a conceit
that I will not wrong my reader so far as to suppose him guilty of.
Indeed if an usurper, that hath no authority over us in such matters,
do prescribe it, we are not bound to formal obedience, that is, to do
it therefore because he commandeth it; but yet I may be bound to it
on some other accounts; and though his command do not bind me,
yet it maketh not the thing itself unlawful.
Quest. V. But is it lawful to pray extempore without a
premeditated form of words?
Answ. No christian of competent understanding doubteth of it. We
must premeditate on our wants, and sins, and the graces and
mercies we desire, and the God we speak to; and we must be able
to express these things without any loathsome and unfit
expressions. But whether the words are fore-contrived or not, is a
thing that God hath no more bound you to by any law, than whether
the speaker or hearers shall use sermon-notes, or whether your
Bibles shall be written or in print.
Quest. VI. If both ways be lawful, which is better?
Answ. If you are to join with others in the church, that is better to
you which the pastor then useth: for it is his office and not yours to
word the prayers which he puts up to God. And if he choose a form,
(whether it be as most agreeable to his parts, or to his people, or for
concord with other churches, or for obedience to governors, or to
avoid some greater inconvenience,) you must join with him, or not
join there at all.[59] But if it be in private, where you are the speaker
yourself, you must take that way that is most to your own edification
(and to others, if you have auditors joining with you). One man is so
unused to prayer, (being ignorantly bred,) or of such unready
memory or expression, that he cannot remember the tenth part so
much of his particular wants, without the help of a form, as with it;
nor can he express it so affectingly for himself or others; nay,
perhaps not in tolerable words. And a form to such a man may be a
duty; as to a dim-sighted man to read by spectacles, or to an
unready preacher to use prepared words and notes. And another
man may have need of no such helps; nay, when he is habituated in
the understanding and feeling of his sins and wants, and hath a
tongue that is used to express his mind even in these matters, with
readiness and facility, it will greatly hinder the fervour of such a
man's affections, to tie himself to premeditated words: to say the
contrary, is to speak against the common sense and experience of
such speakers and their hearers. And let them that yet deride this as
uncertain and inconsiderate praying, but mark themselves, whether
they cannot if they be hungry beg for bread, or ask help of their
physician, or lawyer, or landlord, or any other, as well without a
learned or studied form as with it? Who knoweth not that it is true
which the new philosopher saith: Cartes. de Passion. part i. art. 44.
Et cum inter loquendum solum cogitamus de sensu illius rei, quam
dicere volumus, id facit ut moveamus linguam et labra celerius et
melius, quam si cogitaremus ea movere omnibus modis requisitis ad
proferenda eadem verba; quia habitus quem acquisivimus cum
disceremus loqui, &c. Turning the thoughts too solicitously from the
matter to the words, doth not only mortify the prayers of many, and
turn them into a dead form, but also maketh them more dry and
barren even as to the words themselves. The heavy charge, and
bitter, scornful words which have been too common in this age,
against praying without a set form by some, and against praying
with a book or form by others, is so dishonourable a symptom or
diagnostic of the church's sickness, as must needs be matter of
shame and sorrow to the sounder, understanding part. For it cannot
be denied, but it proves men's understandings and charity to be
both exceedingly low.
Quest. VII. Must we always pray according to the method of the
Lord's prayer, and is it a sin to do otherwise?
Answ. 1. The Lord's prayer is first a rule for your desires; and it is
a sin, if your desires follow not that method. If you do not begin in
your desires with God, as your ultimate end, and if you first desire
not his glory, and then the flourishing of his kingdom, and then the
obeying of his laws, and herein the public welfare of the world,
before and above your particular benefit. And it is a sin if you desire
not your daily bread, (or necessary support of nature,) as a lower
mercy in order to your higher spiritual mercies; and if you desire not
pardon of sin, as a means to your future sanctity, duty, and felicity;
and if you desire not these, as a means to the glory of God, and take
not his praises as the highest part of your prayers. But for the
expressing of these desires, particular occasions may warrant you
ofttimes to begin in another order: as when you pray for the sick, or
pray for directions, or a blessing before a sermon or some particular
work, you may begin and end with the subject that is before you, as
the prayers of holy men in all ages have done. 2. You must
distinguish also, as between desires and expressions, so between a
universal and a particular prayer. The one containeth all the parts of
prayer, and the other is but about some one subject or part, or but
some few; this last being but one or few, particular petitions cannot
possibly be uttered in the method of a universal prayer which hath
all the parts. There is no one petition in the Lord's prayer, but may
be made a prayer itself; and then it cannot have the other petitions
as parts. 3. And you must distinguish between the even and ordinary
case of a christian, and his extraordinary case, when some special
reason, affection, or accident calleth him to look most to some one
particular. In his even and ordinary case, every universal prayer
should be expressed in the method of the Lord's prayer; but in cases
of special reason and inducement it may be otherwise.
Quest. VIII. Must we pray always when the Spirit moveth us, and
only then, or as reason guideth us?
Answ. There are two sorts of the Spirit's motions; the one is by
extraordinary inspiration or impulse, as he moved the prophets and
apostles, to reveal new laws, or precepts, or events, or to do some
actions without respect to any other command than the inspiration
itself. This christians are not now to expect, because experience
telleth us that it is ceased; or if any should pretend to it as not yet
ceased, in the prediction of events, and direction in some things
otherwise indifferent, yet it is most certain that it is ceased as to
legislation; for the Spirit itself hath already given us those laws,
which he hath declared to be perfect, and unchangeable till the end
of the world: the other sort of the Spirit's working, is not to make
new laws or duties, but to guide and quicken us in the doing of that
which is our duty before by the laws already made. And these are
the motions that all true christians must now expect. By which you
may see, that the Spirit and reason are not to be here disjoined,
much less opposed. As reason sufficeth not without the Spirit, being
dark and asleep; so the Spirit worketh not on the will but by the
reason: he moveth not a man as a beast or stone, to do a thing he
knoweth not why; but by illumination giveth him the soundest
reason for the doing of it: and duty is first duty before we do it; and
when by our own sin we forfeit the special motions or help of the
Spirit, duty doth not thereby cease to be duty, nor our omission to
be sin. If the Spirit of God teach you to discern the meetest season
for prayer, by considering your affairs, and when you are most free,
this is not to be denied to be the work of the Spirit, because it is
rational (as fanatic enthusiasts imagine). And if you are moved to
pray in a crowd of business, or at any time when reason can prove
that it is not your duty but your sin, the same reason proveth that it
was not the Spirit of God that moved you to it: for the Spirit in the
heart is not contrary to the Spirit in the Scripture. Set upon the duty
which the Spirit in the Scripture commandeth you, and then you may
be sure that you obey the Spirit; otherwise you disobey it. Yea, if
your hearts be cold, prayer is a likelier means to warm them, than
the omission of it. To ask whether you may pray while your hearts
are cold and backward, is as to ask whether you may labour or come
to the fire before you are warm. God's Spirit is likelier to help you in
duty, than in the neglect of it.
Quest. IX. May a man pray that hath no desire at all of the grace
which he prayeth for?
Answ. No; because it is no prayer, but dissembling; and
dissembling is no duty. He that asketh for that which he would not
have, doth lie to God in his hypocrisy. But if a man have but cold and
common desires, (though they reach not to that which will prove
them evidences of true grace), he may pray and express those
desires which he hath.
Quest. X. May a man pray that doubteth of his interest in God,
and dare not call him Father as his child?
Answ. 1. There is a common interest in God, which all mankind
have, as he is good to all: and as his mercy through Christ is offered
to all; and thus those that are not regenerate are his children by
creation, and by participation of his mercy; and they may both call
him Father and pray to himself, though yet they are unregenerate.
[60] 2. God hath an interest in you, when you have no special
interest in him: therefore his command must be obeyed which bids
you pray. 3. Groundless doubts will not disoblige you from your duty;
else men might free themselves from almost all their obedience.
Quest. XI. May a wicked or unregenerate man pray, and is he
accepted? Or is not his prayer abominable to God?
Answ. 1. A wicked man as a wicked man, can pray no how but
wickedly, that is, he asketh only for things unlawful to be asked, or
for lawful things to unlawful ends; and this is still abominable to
God.[61] 2. A wicked man may have in him some good that
proceedeth from common grace; and this he may be obliged to
exercise, and so by prayer to express his desires so far as they are
good. 3. A wicked man's wicked prayers are never accepted, but a
wicked man's prayers which are for good things, from common
grace, are so far accepted as that they are some means conducing
to his reformation; and though his person be still unjustified, and
these prayers sinful, yet the total omission of them is a greater sin.
4. A wicked man is bound at once to repent and pray, Acts viii. 22;
Isa. lv. 6, 7. And whenever God bids him ask for grace, he bids him
desire grace; and to bid him pray, is to bid him repent and be of a
better mind: therefore those that reprove ministers for persuading
wicked men to pray, reprove them for persuading them to
repentance and good desires. But if they pray without that
repentance which God and man exhort them to, the sin is theirs: but
all their labour is not lost if their desires fall short of saving sincerity;
they are under obligations to many duties, which tend to bring them
nearer Christ, and which they may do without special, saving grace.
Quest. XII. May a wicked man pray the Lord's prayer, or be
exhorted to use it?
Answ. 1. The Lord's prayer in its full and proper sense, must be
spoken by a penitent, believing, justified person;[62] for in the full
sense no one else can call him our Father (though in a limited sense
the wicked may): and they cannot desire the glory of God, and the
coming of his kingdom, nor the doing of his will on earth as it is in
heaven, and this sincerely, without true grace (especially those
enemies of holiness, that think it too much strictness to do God's will
on earth, ten thousand degrees lower than it is done in heaven). Nor
can they put up one petition of that prayer sincerely according to the
proper sense; no, not to pray for their daily bread, as a means of
their support while they are doing the will of God, and seeking first
his glory and his kingdom. But yet it is possible for them to speak
these words from such common desires as are not so bad as none at
all.
Quest. XIII. Is it idolatry to pray to saints or angels? or is it always
sinful?
Answ. I love not to be too quarrelsome with other men's
devotions; but, 1. I see not how praying to an angel or a departed
saint can be excused from sin.[63] Because it supposeth them to be
every where present, or to be omniscient, and to know the heart,
yea, to know at once the hearts of all men; or else the speaker
pretendeth to know when the saint or angel is present and heareth
him, and when not: and because the Scripture doth no where signify
that God would have us pray to any such saints or angels; but
signifieth enough to satisfy us of the contrary. 2. But all prayer to
them is not idolatry, but some is, and therefore we must distinguish,
if we will judge righteously. (1.) To pray to saints or angels as
supposed omnipresent, omniscient, or omnipotent, is flat idolatry.
(2.) To pray to them to forgive us our sins against God, or to justify,
or sanctify, or redeem, or save us from hell, or any thing which
belongeth to God only to do, is no better than idolatry. (3.) But to
pray to them only to do that which belongeth to the guardian, or
charitable office that is committed to them, and to think that though
they are not omnipresent nor omniscient, nor you know not whether
they hear you at this time or not, yet you will venture your prayers
at uncertainty, it being but so much labour lost; this I take to be
sinfully superstitious, but not idolatry.[64] (4.) But to pray to living
saints or sinners, for that which belongeth to them to give, is no sin
at all.
Quest. XIV. Is a man bound to pray ordinarily in his family?
Answ. I have answered this affirmatively before, and proved it;
one grain of grace would answer it better than arguments can do.
Quest. XV. Must the same man pray secretly that hath prayed in
his family or with others?
Answ. 1. Distinguish between those that were the speakers, and
those that were not; and, 2. Between those that have leisure from
greater or more urgent duties, and those that have not. And so, (1.)
Those that are free from the urgency of all other duties, which at
that time are greater, should pray both in the family and in secret;
especially if they were not themselves the speakers, usually they will
have the more need of secret prayer; because their hearts in public
may easilier flag, and much of their case may be omitted. (2.) But
those that have more urgent, greater duties, may take up at that
time[65] with family prayer alone (with secret ejaculations, especially
if they were the speakers); having there put up the same requests
as they would do in secret.
Quest. XVI. Is it best to keep set hours for prayer, or to take the
time which is fittest at present?
Answ. Ordinarily set times will prove the fittest times; and to leave
the time undetermined and uncertain, will put all out of order, and
multiply impediments, and hinder duty. But yet when extraordinary
cases make the ordinary time unfit, a fitter time must be taken.
Quest. XVII. Is it lawful to join in family (or church) prayers with
ungodly men?
Answ. I join both together, because the cases little differ; for the
pastor hath the government of the people in church worship, as the
master of the family hath in family worship. You may choose at first
whether you will be a member of the church or family (if you were
not born to it as your privilege); but when you are a member of
either, you must be governed as members. And to the case, 1. You
must distinguish between professed wicked men, and those that sin
against their profession. 2. And between a family (or church) that is
totally wicked, and that which is mixed of good and bad. 3. And
between those wicked men whose presence is your sin, because you
have power to remove them, and those whose presence is not your
sin, nor the matter in your power. 4. And between one that may yet
choose of what family he will be, and one that may not. And so I
answer, (1.) If it be the fault of the master of the family (or the
pastors of the church) that such wicked men are there, and not cast
out, then it is their sin to join with them, because it is their duty to
remove them; but that is not the case of the fellow-servants, (or
people,) that have no power. (2.) If that wicked men profess their
wickedness, after sufficient admonition, you must professedly
disown communion with them; and then you are morally separated
and discharged, when you have no power locally to separate. (3.) It
is your sin to fly from your duty, because a wicked man is there,
whom you have no power to remove. (4.) There are many prayers
that a wicked man is bound to put up to God; and you must not
omit your duty, because he performeth his, though faultily; methinks
you should more scruple joining or conversing with one that
forsaketh prayer (which is the greater sin) than with one that
prayeth. (5.) But if you are free to choose, you are to be blamed if
you will not choose a better family (or church) (other things being
equal): especially if all the company be wicked.
Quest. XVIII. But what if the master of a family (or pastor) be a
heretic or ungodly?
Answ. You must distinguish between his personal faults, and the
faults of his performance or worship. His personal faults (such as
swearing or drunkenness, &c.) you must disown, and must not
choose a master (or pastor) that is such, while you have your
choice, and may have better; but otherwise it is lawful to join with
him in doing good, though not in evil. But if the fault of his duty
itself be intolerable you must not join with him. Now it is intolerable
in these cases: 1. In case he be utterly unable to express a prayer,
and so make it no prayer. 2. In case he bend his prayers against
godliness, and known truth, and charity, and peace, and so make his
prayers but the instruments of mischief, to vent heresy, or malice,
and do more hurt than good to others.
Quest. XIX. May we pray absolutely for outward mercies, or only
conditionally?
Answ. You must distinguish, 1. Between a condition spoken of the
subject, when we are uncertain whether it be a mercy or not, and an
extrinsic condition of the grant. 2. Between a condition of prayer,
and a condition of expectation. 3. Between submission to God's will,
and a conditional desire or prayer. And so I answer, (1.) It is
necessary when we are uncertain whether the thing itself be good or
not, that we pray with a subjective conditionality: Grant this if it be
good; or, If it be not good I do not pray for it. For it is presupposed
in prayer that we know the thing prayed for to be good. (2.) But
when we know the thing to be a mercy and good, we may pray for it
absolutely. (3.) But we may not believe that we shall receive all with
an absolute expectation, which we absolutely pray for. For prayer
being the expression of desire, that which may be absolutely
desired, though not absolutely promised, may be absolutely prayed
for. (As our increase or strength of grace, or the conversion of our
relations, &c.) (4.) But yet all such must be asked with a submission
to the will of God: but that maketh it not properly a conditional form
of praying; for when the nature of prayer is as it were to move the
will of God, it is not so proper to say, Lord, do this if it be thy will
already; or, Lord, be pleased to do this if it be thy pleasure; as to
say, Lord, grant this mercy; but if thou deny it, it is my duty to
submit. So Christ mentioned both the subjective conditionality and
the submission of his will. Matt. xxvi. 39, "If it be possible, let this
cup pass from me: nevertheless not as I will, but as thou wilt." As if
he had said, Nature requireth me with a simple nolition to be
unwilling of the suffering, and if it be consistent with the desired
ends of my mediatorship, to be desirous to avoid it; but seeing that
cannot be, my comparing will commandeth this simple will of self-
preservation to submit to thy most perfect will. But if any call this
(submission) a condition, the matter is not great.
Quest. XX. May we pray for all that we may lawfully desire?
Answ. No: for prayer is not only an expression of desire, but also a
means to attain the thing desired. And some things may be lawfully
desired, (at least with a simple velleity,) which may not be sought,
because they must not be hoped for, where God hath said that he
will not grant them. For it is vain to seek that which you have no
hope to find: as to desire to see the conversion of the whole world,
or to pass to heaven as Enoch without dying, are lawful (by a simple
velleity); but all things compared, it is not lawful peremptorily to
desire it, without submission; and therefore not to ask it. It is the
expression of a comparate, determinate desire, which is properly
called prayer, being the use of means for the obtaining of that
desire; and whatsoever I may so desire, I may pray for; for if there
be no hope of it, I may not so desire it. But the desire by way of
simple velleity may not be put into a proper prayer, when there is no
hope. I must have a simple desire (with submission) to attain a
sinless perfection here, even this hour; but because there is no
hope, I may not let it proceed to a determinate peremptory desire
upon a comparing judgment, nor into a proper prayer. And yet these
velleities may be expressed in prayer, though they have not the full
nature of a prayer. Object. But was not Christ's a prayer? Matt.
xxvi. 39. Answ. Either Christ as man was certain that the cup must
not pass from him, or uncertain. If you could prove him uncertain,
then it is a proper prayer (with submission to his Father's will); but if
he was certain that it was not to pass from him, then it was
analogically only a prayer, it being but a representing of his velleity
to his Father, and not of his determinate will, nor was any means to
attain that end: and indeed such it was, as if he had said, Father, if it
had stood with the ends of my office and thy will, I would have
asked this of thee; but because it doth not, I submit. And this much
we may do.
Quest. XXI. How then can we pray for the salvation of all the
world? must it be for all men collectively? or only for some,
excluding no numerical denominate person?
Answ. Just as Christ prayed here in this text, we must express our
simple velleity of it to God, as a thing that in itself is most desirable
(as the passing of the cup was unto Christ): but we cannot express a
determinate volition, by a full prayer, such as has any tendency as a
means to attain that end; because we are certain that God's will is
against it, or that it will not be.
Quest. XXII. May we pray for the conversion of all the nations of
the world to christianity, with a hopeful prayer?
Answ. Yes: For we are not certain that every nation shall not be so
converted, though it be improbable.
Quest. XXIII. May we pray in hope with a proper prayer (as a
means to obtain it) that a whole kingdom may be all truly converted
and saved?
Answ. Yes: for God hath no way told us that it shall not be;
though it be a thing improbable, it is not impossible; and therefore
being greatly desirable may be prayed for. Though Christ has told us
that his flock is little, and few find the way of life, yet that may stand
with the salvation of a kingdom.
Quest. XXIV. May we pray for the destruction of the enemies of
Christ, or of the gospel, or of the king?
Answ. Not with respect to that which is called God's antecedent
will, for so we ought first to pray for their conversion (and restraint
till then); but with respect to that called his consequent will we may;
that is, we must first pray that they may be restrained and
converted, and secondly, that if not, they may be destroyed.
Quest. XXV. What is to be thought of that which some call a
particular faith in prayer? If I can firmly believe that a lawful prayer
shall be granted in kind, may I not be sure by a divine faith that it
shall be so?
Answ. Belief hath relation to a testimony or revelation. Prayer may
be warranted as lawful, if the thing be desirable, and there be any
possibility of obtaining it, though there be no certainty, or flat
promise; but faith or expectation must be warranted by the promise.
If God have promised you the thing prayed for, you may believe that
you shall receive it: otherwise your particular faith is a fancy, or a
believing of yourselves, and not a believing God that never promised
you the thing. Object. Matt. xxi. 22, "And all things whatsoever you
ask in prayer, believing, ye shall receive."[66] Answ. There are two
sorts of faith: the one a belief that is ordinary, having respect to
ordinary promises and mercies: the text can be understood of this in
no other sense than this: All things which I have promised you, you
shall receive, if you ask them believingly. But this is nothing to that
which is not promised. The other faith was extraordinary, in order to
the working of miracles: and this faith was a potent inward
confidence, which was not in the power of the person when he
pleased, but was given like an inspiration by the Spirit of God, when
a miracle was to be wrought; and this seemeth to be it that is
spoken of in the text. And this was built on this extraordinary
promise, which was made not to all men in all ages, but to those
times when the gospel was to be sealed and delivered by miracles;
and especially to the apostles. So that in these times, there is
neither such a promise of our working miracles as they had to
believe, nor yet a power to exercise that sort of extraordinary faith.
Therefore a strong conceit (though it come in a fervent prayer) that
any thing shall come to pass, which we cannot prove by any promise
or prophecy, is not to be called any act of divine faith at all, nor to
be trusted to.
Quest. XXVI. But must we not believe that every lawful prayer is
accepted and heard of God?
Answ. Yes: but not that it should be granted in the very thing,
unless so promised: but you may believe that your prayer is not lost,
and that it shall be a means of that which tendeth to your good,
Rom. viii. 28; Isa. xlv. 19.
Quest. XXVII. With what faith must I pray for the souls or bodies
of other men; for their conversion or their lives?
Answ. A godly man may pray for wicked relations or others, with
more hope than they can pray for themselves, while they remain
ungodly: but yet not with any certainty of prevailing for the thing he
asketh; for it is not peremptorily promised him. Otherwise Samuel
had prevailed for Saul, and Isaac for Esau, and David for Absalom,
and the good people for all the wicked; and then no godly parents
would have their children lost; no, nor any in the world would perish,
for godly persons pray for them all. But those prayers are not lost to
him that puts them up.
Quest. XXVIII. With what faith may we pray for the continuance of
the church and gospel to any nation?
Answ. The former answer serveth to this; our hope may be
according to the degrees of probability: but we cannot believe it as a
certainty by divine faith, because it is not promised by God.
Quest. XXIX. How may we know when our prayers are heard of
God, and when not?
Answ. Two ways: sometimes by experience, when the thing itself
is actually given us; and always by the promise; when we ask for
that which God commandeth us to ask, or promiseth to grant; for we
are sure God's promises are all fulfilled. If we ask for the objects of
sense (as food or raiment, or health, &c.) sense will tell us whether
our prayers be granted in the same kind that we asked for; but if the
questions be of the objects of faith, it is faith that must tell you that
your prayers are granted; but yet faith and reason make use of
evidences or signs. As if I pray for pardon of sin, and salvation, the
promise assureth me, that this prayer is granted, if I be a penitent,
believing, regenerate person, otherwise not; therefore faith only
assureth me that such prayers are granted, supposing that I discern
the evidence of my regeneration, repentance, and faith in Christ. So
if the question be whether my prayer for others, or for temporal
mercies, be answered in some other kind, and conduce to my good
some other way, faith only must tell you this from the promise, by
the help of evidences. There are millions of prayers that will all be
found answered at death and judgment, which we knew not to be
answered any way but by believing it.
Quest. XXX. What should a christian of weak parts do, that is dry
and barren of matter, and can scarce tell what to say in prayer, but is
ready to rise off his knees almost as soon as he hath begun?
How to have
constant supply of
matter.
Answ. 1. He must not be a stranger to himself,
but study well his heart and life: and then he will
find such a multitude of inward corruptions to
lament, and such a multitude of wants to be
supplied, and weaknesses to be strengthened, and disorders to be
rectified, and actual sins to be forgiven, that may find him work
enough for confessions, complaints, and petitions many days
together, if expression be but as ready as matter. 2. Let him study
God, and get the knowledge of his nature, attributes, and works:
and then he will find matter enough to aggravate his sin, and to
furnish him with the holy praise of God from day to day. As he that is
acquainted with all that is in any book, can copiously discourse of it,
when he that knoweth not what is in it, hath little to say of it; so he
that knoweth God and his works (and himself, and his sins and
wants) is acquainted with the best prayer book, and hath always a
full heap of matter before him, whenever he cometh to speak to
God. 3. Let him study the mystery of man's redemption, and the
person, and office, and covenant, and grace of Christ; and he need
not want matter for prayer or praise. A very child, if he sees but a
pedlar's pack opened, where there are abundance of things which he
desireth, will learn without book to say, O father, buy me this, and
give me that, &c. So will the soul that seeth the treasures and riches
of Christ.[67] 4. Let him know the extent of the law of God, and the
meaning of the ten commandments: if he know but what sins are
forbidden in each commandment, and what duties are required, he
may find matter enough for confession and petition: and therefore
the view of such a brief exposition of the commandments, as you
may find in Mr. Brinsley's "True Watch," and in Dr. Downam's and Mr.
Whateley's "Tables," will be a present furniture for such a use,
especially in days of humiliation. So it will also to have a particular
understanding of the creed and the Lord's prayer, which will furnish
you with much matter. 5. Study well the temptations which you carry
about you in your flesh, and meet with in the world, and are
suggested by the tempter; and think of the many duties you have to
do, and the many dangers and sufferings to undergo, and you will
How to keep up
fervency in prayer.
never be unfurnished for matter for your prayers. 6. Observe the
daily passages of providence, to yourselves and others; mark how
things go with your souls every day, and hearken how it goeth with
the church of God, and mark also how it goeth with your
neighbours, and sure you will find matter enough for prayer. 7. Think
of the heavenly joys that you are going to, and the streets of the
New Jerusalem will be large enough for faith to walk in. 8. For
words, be acquainted with the phrase of Scripture, and you will find
provisions for all occasions. Read Dr. Wilkins's book, called "The gift
of Prayer," or Mr. Brinsley's "Watch," or Mr. E. Parr's "Abba, Father."
9. Keep up the heart in a reverent, serious, lively frame, and it will
be a continual spring to furnish you with matter; when a dead and
barren heart hath a dry and sleepy tongue. 10. Join as often as you
can with those that are full and copious in prayer; for example and
use will be very great helps. 11. Quench not the Spirit of God that
must assist you. 12. In case of necessity, use those books or forms
which are more full than you can be yourselves till you come to
ability to do better without them. Read further the directions part i.
chap. vi. tit. 2, for more.
Quest. XXXI. How should a christian keep up an ordinary fervency
in prayer?
Answ. 1. See that knowledge and faith provide
you matter; for as the fire will go out if there be
not fuel, so fervency will decay when you are dry,
and scarce know what to say, or do not well believe what you
understand. 2. Clog not the body either with over-much eating and
drinking, or over-tiring labours; for an active body helpeth much the
activity of the mind; and the holiest person will be able but poorly to
exercise his fervency, under a dull or languishing body. 3. Rush not
suddenly upon prayer, out of a crowd of other businesses, or before
your last worldly cares or discourses be washed clean out of your
minds. In study and prayer how certain a truth is it, that Non bene
fit quod occupato animo fit. Hieron. Epist. 143. ad Paulin. That work
is not well done, which is done with a mind that is prepossessed, or
busied about other matters: that mind must be wholly free from all
other present thoughts or business, that will either pray or study
well. 4. Keep a tender heart and conscience that is not senseless of
your own concernments; for all your prayers must needs be sleepy,
if the heart and conscience be once hardened, seared, or fallen
asleep. 5. Take more pains with your hearts than with your tongues.
Remember that the success of your work lieth most on them. Bear
not with their sluggishness; do by them as you would do by your
child or servant that sleepeth by you at prayer; you will not let them
snort on, but jog them till you have awakened them. So do by your
hearts when you find them dull. 6. Live as in the continual presence
of God; but labour to apprehend his special presence when you are
about to speak to him: ask your hearts how they would behave
themselves, if they saw the Lord, or but the lowest of his holy
angels? 7. Let faith be called up to see heaven and hell as open all
the while before you; and such a sight will surely keep you serious.
8. Keep death and judgment in your continual remembrance and
expectation: remember how all your prayers will be looked back
upon. Look not for long life: remember that this prayer for aught you
know may be your last; but certainly you have not long to pray: pray
therefore as a dying man should do. 9. Study well the unspeakable
necessity of your souls. If you prevail not for pardon, and grace, and
preservation, you are undone and lost for ever. Remember that
necessity is upon you, and heaven or hell are at the end, and you
are praying for more than a thousand lives. 10. Study well the
unspeakable excellency of those mercies which you pray for: O think
how blessed a life it would be, if you could know God more, and love
him more, and live a blameless, heavenly life, and then live with
Christ in heaven for ever! Study these mercies till the flames of love
put life into your prayers. 11. Study well the exceeding
encouragements that you have to pray and hope; if your hope decay
your fervour will decay. Think of the unconceivable love of God, the
astonishing mercy showed to you in your Redeemer, and in the helps
of the Holy Spirit, and how Christ is now interceding for you. Think
of these till faith make glad your heart; and in this gladness, let
praise and thanksgiving have ordinarily no small share in your
prayers; for it will tire out the heart to be always poring on its own
distempers, and discourage it to look on nothing but its infirmities;
and then, a sad, discouraged temper will not be so lively a temper,
as a thankful, praiseful, joyful temper is: for lætitia loquax res est,
atque ostentatrix sui; Gladness is a very expressive thing, and apt to
show itself.[68] But tristes non eloquentes sunt: maxime si ad
ægritudinem animi accedat corporis ægritudo. Hieron. Epist. 31. ad
Theoph. Alexand. Sad men are seldom eloquent; especially if the
body be sick as well as the mind. 12. Let the image of a praying and
a bleeding Christ, and of his praying saints, be (not on a wall before
your eyes, but) engraven on your minds. Is it not desirable to be
conformed to them? Had they more need to pray importunately than
you? 13. Be very cautelous in the use of forms, lest you grow dull
and customary, and before you are aware your tongues use to go
without your hearts. The heart is apt to take its ease when it feeleth
not some urgent instigation. And though the presence of God should
serve the turn without the regard of man, yet with imperfect men
the heart is best held to its duty when both concur. And therefore
most are more cautelous of their words, than of their thoughts; as
children will learn their lesson better, when they know their masters
will hear them it, than when they think he will not. Now in the use of
a form of prayer, a sleepy heart is not at all discerned by man, but
by God only; for the words are all brought to your hand, and may be
said by the most dull and careless mind; but when you are put to
express your own desire, without such helps, you are necessitated to
be so mindful of what you do, as to form your desires into apt
expressions, or else your dulness or inattentiveness will be observed
even by men; and you will be like one that hath his coach, or horse,
or crutches taken off him, that if he have legs must use them, or
else lie still. And to them that are able, it is often a great benefit to
be necessitated to use the ability they have; though to others it is a
loss to be deprived of their helps.[69] I speak not this against the
lawfulness of a form of prayer; but to warn you of the temptations
which are in that way. 14. Join oft with the most serious, fervent
christians; for their fervour will help your hearts to burn, and carry
you along with them. 15. Destroy not fervency by adulterating it,
and turning it into an affected earnestness of speech, and loudness
of voice, when it is but a hypocritical cover for a frozen, empty
heart.
Quest. XXXII. May we look to speed ever the better for any thing
in ourselves, or in our prayers? Is not that to trust in them, when we
should trust on Christ alone?
Answ. We must not trust in them for any thing that is Christ's part
and not theirs; but for their own part it is a duty to trust in them
(however quarrelsome persons may abuse or cavil at the words):
and he that distrusteth prayer in that which is its proper office, will
pray to little purpose: and he that thinks that faithful, fervent,
importunate, understanding prayer, is no more effectual with God for
mercy, than the babbling of the hypocrite, or the ignorant, careless,
unbelieving, sleepy prayers of the negligent, will either not care how
he prayeth, or whether he prayeth at all or not. Though our persons
and prayers have nothing that is meritorious with God, in point of
commutative justice, nor as is co-ordinate with the merits of Christ,
yet have they conditions without which God will not accept them,
and are meritorious in subordination to the merit of Christ, in point
of paternal governing justice according to the covenant of grace; as
an obedient child deserveth more love, and praise, and reward from
his father than the disobedient: as the ancient fathers commonly
used the word merit.[70]
Quest. XXXIII. How must that person and prayer be qualified that
shall be accepted of God?
Answ. There are several degrees of God's acceptance. I. That
which is but from common grace, may be accepted as better than
none at all. II. That which hath a promise of some success,
especially as to pardon and salvation, must be, 1. From a penitent,
believing, holy person. 2. It must proceed from true desire, and be
sincere; and have renewed faith and repentance in some measure.
3. It must be put up in confidence on the merit and intercession of
Christ. 4. It must be only for things lawful. 5. And to a lawful end.
III. That which is extraordinarily accepted and successful, must be
extraordinary in all these respects; in the person's holiness, and in
renewed faith and fervent importunity, and holy love.
Tit. 3. Special Directions for Family Prayer.
Direct. I. Let it be done rather by the master of the family himself
than any other, if he be competently able, though others be more
able; but if he be utterly unfit, let it rather be done by another than
not at all; and by such an one as is most acceptable to the rest, and
like to do most good.
Direct. II. Let prayer be suited to the case of those that join in it,
and to the condition of the family; and not a few general words
spoken by rote, that serve all times and persons alike.
Direct. III. Let it neither be so short as to end before their hearts
can be warm and their wants expressed (as if you had an unwilling
task to slubber over, and would fain have done); nor yet so tedious
as to make it an ungrateful burden to the family.
Direct. IV. Let not the coldness and dulness of the speaker rock
the family asleep; but keep awake your own heart, that you may
keep the rest awake, and force them to attention.
Direct. V. Pray at such hours as the family may be least distracted,
sleepy, tired, or out of the way.
Direct. VI. Let other duties concur, as oft as may be, to assist in
prayer: as reading, and singing psalms.
Direct. VII. Do all with the greatest reverence of God that possibly
you can; not seeming reverence, but real; that so more of God than
of man may appear in every word you speak.
Direct. VIII. The more the hearers are concerned in it, the more
regard you must have to the fitness of your expressions; for before
others, words must be regarded, lest they be scandalized, and God
and prayer be dishonoured. And if you cannot do it competently
without, use a well-composed form.
Direct. IX. Let not family prayer be used at the time of public
prayer in the church, nor preferred before it, but prefer public prayer,
though the manner were more imperfect than your own.
Direct. X. Teach your children and servants how to pray
themselves, that they may not be prayerless when they come among
those that cannot pray. John and Christ taught their disciples to pray.
Tit. 4. Special Directions for Secret Prayer.
Direct. I. Let it be in as secret a place as conveniently you can;
that you may not be disturbed. Let it be done so that others may not
be witnesses of it, if you can avoid it; and yet take it not for your
duty, to keep it unknown that you pray secretly at all: for that will be
a snare and scandal to them.
Direct. II. Let your voice be suited to your own help and benefit, if
none else hear you. If it be needful to the orderly proceeding of your
own thoughts, or to the warming of your own affections, you may
use a voice; but if others be within hearing, it is very unfit.
Direct. III. In secret let the matter of your prayers be that which is
most peculiarly your own concernment, or those secret things that
are not fit for public prayer, or are there passed by; yet never
forgetting the highest interest of Christ, and the gospel, and the
world and church.
Direct. IV. Be less solicitous about words in secret than with
others, and lay out your care about the heart; for that is it that God
most esteemeth in your prayers.
Direct. V. Do not through carnal unwillingness grow into a neglect
of secret prayer, when you have time; nor yet do you superstitiously
tie yourselves to just so long time, whether you are fit, or at leisure
from greater duties, or not. But be the longer when you are most fit
and vacant, and the shorter when you are not. To give way to every
carnal backwardness, is the sin on one side; and to resolve to spend
so long time, when you do but tire yourselves, and sleep, or
business, or distemper maketh it a lifeless thing, is a sin on the other
side. Avoid them both.
Direct. VI. A melancholy person who is unfit for much solitariness
and heart-searchings, must be much shorter, if not also seldomer in
secret prayers, than other christians that are capable of bearing it:
and they must, instead of that which they cannot do, be the more in
that which they can do; as in joining with others, and in shorter
ejaculations, besides other duties; but not abating their piety in the
main upon any pretence of curing melancholy.
FOOTNOTES
[53] The Stoics say, Orabit sapiens ac vota faciet bona à diis
postulans. Laert. in Zenone. So that when Seneca saith, Cur Deos
precibus fatigatis, &c. he only intendeth to reprove the slothful, that
think to have all done by prayer alone, while they are idle and
neglect the means.
[54] Plerumque hoc negotium plus genscibus quam sermonibus
agitur. August. Epist. 121.
[55] Bias navigabat aliquando cum impiis, et quum navis
tempestate, quateretur, illique Deos invocarent; silete, inquit, ne vos
hic illi navigare sentiant. Laert. p. 55.
[56] Of the method of the Lord's Prayer, see Ramus de Relig.
Christ. lib. iii. cap. 3. et Ludolphus de Vita Christi, part i. cap. 37. et
Perkins in Orat. Dom. and Dr. Boys on the Liturgy, p. 5-7.
[57] Selden in Eutychii Alexandr. Orig. p. 42, 43, showeth that
before Ezra the Jews prayed without forms, and that Ezra and the
elders with him, composed them a form which had eighteen
benedictions and petitions, that is, the three first and the three last
for the glorifying God, and the rest intermediate for personal and
public benefits. And, pag. 48, that they might omit none of these,
but might add others.
[58] See Selden ubi supra, proving that the Jews had a form of
prayer since Ezra's time; therefore it was in Christ's time. Yet he and
his apostles joined with them, and never contradicted or blamed
them for forms.
[59] Three or four of these cases as to church prayers are largelier
answered afterward, part iii. Socrates alius Cous deorum
precationes, invocationesque conscripsit. Laert. in Socrate.
[60] Psal. xlii. 9; xxii. 1; John ii. 14; Jer. xxxi. 9; Luke xv. 12,
17, 19; Mal. ii. 10.
[61] Acts xv. 17; xvii. 27; viii. 22; Isa. lv. 6; Psal. xiv. 4.
[62] Heb. xi. 6; Rom. x. 14.
[63] Psal. lxv. 2; Isa. lxiii. 16; Psal. cxlv. 18; 1 Kings viii. 39; Acts i.
24; Rom. viii. 27; x. 14; Psal. lxii. 8; Matt. iv. 9.
[64] Rev. xxii. 8, 9; Col. ii. 18.
[65] Mark that I say but "at that time."
[66] Mark xi. 23, 24.
[67] Rev. iii. 17, 18.
[68] Symmach. Epist. 31. 1. 1. ad Auson.
[69] See Mr. Mayo's Directions on this case.
[70] See my "Confession" of this at large.
What are the ends
of the sacrament?
CHAPTER XXIV.
BRIEF DIRECTIONS FOR FAMILIES, ABOUT THE SACRAMENT OF
THE BODY AND BLOOD OF CHRIST.
Omitting those things which concern the public administration of this
sacrament, (for the reasons before intimated part ii.) I shall here
only give you some brief directions for your private duty herein.
Direct. I. Understand well the proper ends to
which this sacrament was instituted by Christ; and
take heed that you use it not to ends for which it
never was appointed. The true ends are these: 1. To be a solemn
commemoration of the death and passion of Jesus Christ, to keep it,
as it were, in the eye of the church, in his bodily absence till he
come, 1 Cor. xi. 24-26. 2. To be a solemn renewing of the holy
covenant which was first entered in baptism, between Christ and the
receiver; and in that covenant it is, on Christ's part, a solemn
delivery of himself first, and with himself the benefits of pardon,
reconciliation, adoption, and right to life eternal. And on man's part,
it is our solemn acceptance of Christ with his benefits, upon his
terms, and a delivering up of ourselves to him, as his redeemed
ones, even to the Father as our reconciled Father, and to the Son as
our Lord and Saviour, and to the Holy Spirit as our Sanctifier, with
professed thankfulness for so great a benefit. 3. It is appointed to be
a lively objective means, by which the Spirit of Christ should work to
stir up, and exercise, and increase the repentance, faith, desire,
love, hope, joy, thankfulness, and new obedience of believers; by a
lively representation of the evil of sin, the infinite love of God in
Christ, the firmness of the covenant or promise, the greatness and
sureness of the mercy given, and the blessedness purchased and
promised to us, and the great obligations that are laid upon us.[71]
And that herein believers might be solemnly called out to the most
serious exercise of all these graces, and might be provoked and
assisted to stir up themselves to this communion with God in Christ,
and to pray for more as through a sacrificed Christ.[72] 4. It is
appointed to be the solemn profession of believers, of their faith,
and love, and gratitude, and obedience to God the Father, Son, and
Holy Ghost, and of continuing firm in the christian religion. And a
badge of the church before the world. 5. And it is appointed to be a
sign and means of the unity, love, and communion of saints, and
their readiness to communicate to each other.
The false, mistaken ends which you must avoid are these: 1. You
must not, with the papists, think that the end of it is to turn bread
into no bread, and wine into no wine, and to make them really the
true body and blood of Jesus Christ. For if sense (which telleth all
men that it is still bread and wine) be not to be believed, then we
cannot believe that ever there was a gospel, or an apostle, or a
pope, or a man, or any thing in the world. And the apostle expressly
calleth it bread three times, in three verses together, after the
consecration, 1 Cor. xi. 26-28. And he telleth us, that the use of it is
(not to make the Lord's body really present, but) "to show the Lord's
death till he come;" that is, as a visible representing and
commemorating sign, to be instead of his bodily presence till he
come.
2. Nor must you with the papists use this sacrament to sacrifice
Christ again really unto the Father, to propitiate him for the quick
and dead, and ease souls in purgatory, and deliver them out of it.
For Christ having died once dieth no more, and without killing him
there is no sacrificing him. By once offering up himself, he hath
perfected for ever them that are sanctified, and now there remaineth
no more sacrifice for sin: having finished the sacrificing work on
earth, he is now passed into the heavens, to appear before God for
his redeemed ones.[73]
3. Nor is it any better than odious impiety to receive the
sacrament, to confirm some confederacies or oaths of secrecy, for
rebellions or other unlawful designs; as the powder-plotters in
England did.
4. Nor is it any other than impious profanation of these sacred
mysteries, for the priest to constrain or suffer notoriously ignorant
and ungodly persons to receive them;[74] either to make themselves
believe that they are indeed the children of God, or to be a means
which ungodly men should use to make them godly, or which infidels
or impenitent persons must use to help them to repentance and
faith in Christ. For though there is that in it which may become a
means of their conversion, (as a thief that stealeth a Bible or sermon
book, may be converted by it,) yet is it not to be used by the
receiver to that end. For that were to tell God a lie, as the means of
their conversion; for whosoever cometh to receive a sealed pardon,
doth thereby profess repentance, as also by the words adjoined he
must do; and whosoever taketh, and eateth, and drinketh the bread
and wine, doth actually profess thereby, that he taketh and applieth
Christ himself by faith: and therefore, if he do neither of these, he
lieth openly to God: and lies and false covenants are not the
appointed means of conversion. Not that the minister is a liar in his
delivery of it: for he doth but conditionally seal and deliver God's
covenant and benefits to the receiver, to be his, if he truly repent
and believe: but the receiver himself lieth, if he do not actually
repent and believe, as he there professeth to do.
5. Also it is an impious profanation of the sacrament, if any priest,
for the love of filthy lucre, shall give it to those that ought not to
receive it, that he may have his fees or offerings; or, that the priest
may have so much money that is bequeathed for saying a mass for
such or such a soul.
6. And it is an odious profanation of the sacrament, to use it as a
league or bond of faction, to gather persons into the party, and tie
them fast to it, that they may depend upon the priest, and his
faction and interest may thereby be strengthened, and he may seem
to have many followers.
What are the parts
of the sacraments?
7. And it is a dangerous abuse of it, to receive it, that you may be
pardoned, or sanctified, or saved, barely by the work done, or by the
outward exercise alone. As if God were there obliged to give you
grace, while you strive not with your own hearts, to stir them up to
love, or desire, or faith, or obedience, by the means that are before
you; or, as if God would pardon and save you for eating so much
bread and drinking so much wine, when the canon biddeth you; or,
as if the sacrament conveyed grace, like as charms are supposed to
work, by saying over so many words.
8. Lastly, It is no appointed end of this sacrament, that the
receiver thereby profess himself certain of the sincerity of his own
repentance and faith (for it is not managed on the ground of such
certainty only by the receiver; much less by the minister that
delivereth it). But only he professeth, that as far as he can discern
by observing his own heart, he is truly willing to have Christ and his
benefits, on the terms that they are offered; and that he doth
consent to the covenant which he is there to renew. Think not
therefore that the sacrament is instituted for any of these (mistaken)
ends.
Direct. II. Distinctly understand the parts of the
sacrament, that you may distinctly use them, and
not do you know not what. This sacrament
containeth these three parts. 1. The consecration of the bread and
wine, which maketh it the representative body and blood of Christ.
2. The representation and commemoration of the sacrifice of Christ.
3. The communion: or, communication by Christ, and reception by
the people.
1. In the consecration, the church doth first offer the creatures of
bread and wine, to be accepted of God, to this sacred use. And God
accepteth them, and blesseth them to this use; which he signifieth
both by the words of his own institution, and by the action of his
ministers, and their benediction. They being the agents of God to
the people in this accepting and blessing, as they are the agents of
the people to God, in offering or dedicating the creatures to this use.
This consecration having a special respect to God the Father, in it
we acknowledge his three grand relations. 1. That he is the Creator,
and so the Owner of all the creatures; for we offer them to him as
his own. 2. That he is our righteous Governor, whose law it was that
Adam and we have broken, and who required satisfaction, and hath
received the sacrifice and atonement, and hath dispensed with the
strict and proper execution of that law, and will rule us hereafter by
the law of grace. 3. That he is our Father or Benefactor, who hath
freely given us a Redeemer, and the covenant of grace, whose love
and favour we have forfeited by sin, but desire and hope to be
reconciled by Christ.
As Christ himself was incarnate and true Christ, before he was
sacrificed to God, and was sacrificed to God before that sacrifice be
communicated for life and nourishment to souls; so in the
sacrament, consecration must first make the creature to be the flesh
and blood of Christ representative; and then the sacrificing of that
flesh and blood must be represented and commemorated; and then
the sacrificed flesh and blood communicated to the receivers for
their spiritual life.
II. The commemoration chiefly (but not only) respecteth God the
Son. For he hath ordained, that these consecrated representations
should in their manner and measure, supply the room of his bodily
presence, while his body is in heaven; and that thus, as it were, in
effigy, in representation, he might be still crucified before the
church's eyes; and they might be affected, as if they had seen him
on the cross. And that by faith and prayer, they might, as it were,
offer him up to God; that is, might show the Father that sacrifice,
once made for sin, in which they trust, and for which it is that they
expect all the acceptance of their persons with God, and hope for
audience, when they beg for mercy, and offer up prayer or praises to
him.
III. In the communication, though the sacrament have respect to
the Father, as the principal Giver, and to the Son, as both the Gift
and Giver, yet hath it a special respect to the Holy Ghost, as being
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  • 5. Radiometric Tracking Techniques for Deep-Space Navigation Catherine L. Thornton James S. Border MONOGRAPH 1 DEEP–SPACE COMMUNICATIONS AND NAVIGATION SERIES
  • 6. Radiometric Tracking Techniques for Deep-Space Navigation
  • 7. DEEP-SPACE COMMUNICATIONS AND NAVIGATION SERIES Issued by the Deep-Space Communications and Navigation Systems Center of Excellence Jet Propulsion Laboratory California Institute of Technology Joseph H. Yuen, Editor-in-Chief
  • 8. Radiometric Tracking Techniques for Deep-Space Navigation Catherine L. Thornton James S. Border MONOGRAPH 1 DEEP–SPACE COMMUNICATIONS AND NAVIGATION SERIES Jet Propulsion Laboratory California Institute of Technology
  • 9. Radiometric Tracking Techniques for Deep-Space Navigation (JPL Publication 00-11) October 2000 The research described in this publication was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
  • 10. v Table of Contents Foreword ........................................................................................................vii Preface ............................................................................................................. ix Acknowledgments ............................................................................................. xi Chapter 1: Introduction ............................................................................. 1 References ........................................................................................ 2 Chapter 2: Earth-Based Tracking and Navigation Overview ............... 3 2.1 Navigation Process ................................................................. 3 2.2 Reference Frames ................................................................... 5 2.3 Spacecraft Equations of Motion ........................................... 6 References ......................................................................................... 7 Chapter 3: Range and Doppler Tracking Observables ......................... 9 3.1 The Tracking Link .................................................................... 9 3.2 Range and Doppler Information Content .......................... 12 3.3 Tracking Data Error Sources ............................................... 15 3.3.1 Clock Instability ....................................................... 15 3.3.2 Instrumental Effects .................................................. 18 3.3.3 Transmission Media ................................................. 19 3.3.4 Platform Parameters ................................................. 21 3.4 The GPS Calibration and Tracking System ...................... 28 3.5 Range and Doppler System Measurement Performance ................................................. 32 3.6 Range and Doppler System Positioning Performance ..................................................... 34 References ....................................................................................... 37 Chapter 4: VLBI Tracking Observables .................................................. 47 4.1 VLBI System Description ..................................................... 47 4.1.1 Delta VLBI ............................................................... 49 4.1.2 Radio Source Reference Frame ................................ 50
  • 11. vi Table of Contents 4.1.3 Radio and Planetary Frame Tie .................................50 4.1.4 VLBI Calibration System .........................................51 4.1.5 Major Error Sources ..................................................52 4.2 Spacecraft VLBI System Performance ...............................54 4.3 Utility of Open-Loop Recordings ........................................57 References .......................................................................................58 Chapter 5: Future Directions in Radiometric Tracking ........................63 5.1 Doppler and Range ................................................................63 5.2 Very Long Baseline Interferometry ....................................65 5.3 Connected-Element Interferometry ....................................66 5.4 Same-Beam Interferometry ..................................................67 5.5 Spacecraft-to-Spacecraft Tracking .....................................69 References .......................................................................................72 Glossary ........................................................................................................77 Acronyms ......................................................................................................79
  • 12. vii Foreword The Deep Space Communications and Navigation Systems Center of Excellence (DESCANSO) was recently established for the National Aeronau- tics and Space Administration (NASA) at the California Institute of Technol- ogy’s Jet Propulsion Laboratory (JPL). DESCANSO is chartered to harness and promote excellence and innovation to meet the communications and navi- gation needs of future deep-space exploration. DESCANSO’s vision is to achieve continuous communications and precise navigation—any time, anywhere. In support of that vision, DESCANSO aims to seek out and advocate new concepts, systems, and technologies; foster key scientific and technical talents; and sponsor seminars, workshops, and sympo- sia to facilitate interaction and idea exchange. The Deep Space Communications and Navigation Series, authored by sci- entists and engineers with many years of experience in their respective fields, lays a foundation for innovation by communicating state-of-the-art knowledge in key technologies. The series also captures fundamental principles and prac- tices developed during decades of deep-space exploration at JPL. In addition, it celebrates successes and imparts lessons learned. Finally, the series will serve to guide a new generation of scientists and engineers. Joseph H. Yuen DESCANSO Leader October 2000
  • 14. ix Preface Radiometric Tracking Techniques for Deep Space Navigation is an intro- duction to newcomers in this field, a reference to professionals in related fields, and an exposition of the current state of the art. It focuses on a broad array of technologies and concepts developed over the last four decades to support radio navigation of interplanetary spacecraft. The technical terms in the text assume that the reader is familiar with basic engineering and mathematical concepts contained in books such as The Electronics of Radio (D. B. Rutledge, Cambridge University Press, 1999) and Applied Optimal Estimation (A. Gelb, editor, MIT Press, 1974). In addition to an overview of Earth-based radio navigation techniques, the scope of this monograph includes a simplified conceptual presentation of each radiometric measurement type, its information content, and expected measure- ment accuracy. More rigorous treatments may be found in the numerous refer- ences cited. Many of these references pertain to work done at the Jet Propulsion Laboratory (JPL) as part of the development of the very system that is the topic of this monograph. Beyond describing the types of radio measurements that could be made, we also suggest what measurements should be made under various mission condi- tions. The methods we describe for both acquiring and calibrating radiometric measurements provide a robust system to support guidance and navigation for future robotic space exploration. We have drawn the content of this monograph from the work of many JPL colleagues, past and present, in the Tracking Systems and Application Section and the Navigation and Flight Mechanics Section, who have participated in the effort to develop and use state-of-the-art radiometric navi- gation techniques. We are especially indebted to William G. Melbourne for
  • 15. Other documents randomly have different content
  • 16. 2. By Relation, God's children, 1. By Creation: so all are: and therefore all may thus far call him Father. 1. His Own; 2. By Redemption: as all are as to the sufficient price and satisfaction. 2. His Subjects; 3. By Regeneration: and so only the regenerate are children. 3. His Beloved and Beneficiaries, that live upon Him, and to Him, as to their End. 3. By Quality. 1. Dependent on God. Yet 1. Loving God, as their Father. All which is signified in the word OUR— 2. Necessitous. 2. Loving themselves, as men. 3. Sinners. 3. Loving others, as brethren. II. The Prayer, or Petitions, in two parts: of which, I. The first part is according to the order of estimation, intention, and desire; and is, 1. For the end simply, which is GOD; in the word "THY" repeated in every petition. 2. For the end respectively in the interest of God, and that is in I. The highest or ultimate, that is, the glory of God; "HALLOWED BE THY NAME." II. The highest means of his glory, "THY KINGDOM COME;" that is, let the world be subject to thee their Creator and Redeemer; the universal King. III. The next means, being the effect of this: "THY WILL BE DONE," that is, let thy laws be fulfilled, and thy disposals submitted to. 3. For the lower end, even the subject of these means; which is the public good of mankind, the world and church: "IN EARTH," that is, let the world be subjected to thee, and the church obey thee; which will be the greatest blessing to them: ourselves being included in the world. And the measure and pattern is added, "AS IT IS IN HEAVEN," that is, let the earth be conformed as near as may be to the heavenly pattern. So that this part of the Lord's Prayer, proceeding in the order of excellency and intention, directeth us, I. To make God our ultimate, highest end; and to desire his interest first, and in this order, (1.) His glory, (2.) His kingdom, (3.) Obedience to his laws. II. To make the public good of the world and the church our next end, as being the noblest means. III. To include our own interest in and under this, as the least of all; professing first our own consent to that which we desire first for others. II. The second part is according 1. For the support of our nature by necessary means: "GIVE US THIS DAY OUR DAILY BREAD:" this being God's first gift, presupposed both to grace and glory. "GIVE," signifieth our dependence on God for all. "US," our charity, that we desire relief for ourselves and others. "DAILY" (or
  • 17. to the order of execution, and is for ourselves, beginning at the lowest, and ascending, till the end first intended, be last attained: and it is, substantial) "BREAD," our moderation; that we desire not unnecessaries or superfluities. "THIS DAY," the constancy of our dependence, and that we desire not, or care not too much for the future, and promise not ourselves long life. 2. For clearing us from the guilt of all sin past (repentance and faith being here presupposed); where is (1.) The Petition: "AND FORGIVE US OUR DEBTS: (trespasses or sins). (2.) The motive from our qualification for forgiveness: "AS WE FORGIVE OUR DEBTORS:" without which God will not forgive us. 3. For future preservation: (1.) From the means, "LEAD US NOT INTO TEMPTATION:" that is, though thou mayst justly try us, yet pity our frailty, and neither cause nor permit us so to be tried, as may tempt us to sin and ruin. (2.) From the end, "BUT DELIVER US FROM THE EVIL:" that is, 1. The Evil One, Satan (and his instruments). 2. The evil thing: 1. Sin; 2. Misery; which are Satan's end. He that would be saved from hell and misery, must be saved from sin; and he that would be saved from both, must be saved from Satan and from temptation. Quest. But where are the requests for positive holiness, grace, and heaven? Answ. 1. Repentance and faith are supposed in the petitioner. 2. What he wanteth is asked in the three petitions of the first part, that we with others may sanctify God's name, and be the subjects of his kingdom, and do his will, &c. Christ and a state of grace, are finally in the first petition, formally in the second, and expressly in the third. III. The conclusion: the reason and termination of our desires in their ultimate end; here praised: beginning at the lowest, and ascending to the highest: containing, I. What we praise; or the matter; or interest of God, 1. His universal reign, "FOR THINE IS THE KINGDOM," administered variously, agreeably to the subjects: all owe this absolute obedience: who commandest and executest what thou wilt. 2. His own perfections, "THE POWER:" both right and all-sufficiency: including his omniscience and goodness, as well as omnipotence. 3. His incomprehensible excellency and blessedness, as he is the ultimate end of us and all things; "AND THE GLORY," Rom. xi. 36; 1 Cor. x. 31. II. Whom we praise: GOD, in the word "THINE:" in him, the first efficient cause of all things, we begin: his help, as the dirigent cause, we seek: and in him, as the final cause, we terminate. III. The duration. "FOR EVER AND EVER," to eternity: and "AMEN" is the expression of our consent. For of Him, and through Him, and to Him are all things: to Him be glory for ever, Amen, Rom. ix. 36. So that it is apparent that the method of the Lord's prayer is circular, partly analytical, and partly synthetical; beginning with God, and ending in God: beginning with such acknowledgments as are prerequisite to petition, and ending in those praises which petition and grace bestowed tend to: beginning our petitions for God's interest and the public good, according to the order of estimation and intention, till we come to the mere means, and then beginning at the lowest, and ascending according to the order of execution. As
  • 18. the blood passing from the greater to the smaller numerous vessels, is there received by the like, and repasseth to its fountain; such a circular method hath mercy and duty, and consequently our desires. Tit. 2. Some Questions about Prayer answered. The rest of the general directions about prayer, I think will be best contrived into the resolving of these following doubts. Quest. I. Is the Lord's prayer a directory only, or a form of words to be used by us in prayer? Answ. 1. It is principally the rule to guide our inward desires, and outward expressions of them; both for the matter, what we must desire, and for the order which we must desire first and most. 2. But this rule is given in a form of words, most apt to express the said matter and order. 3. And this form may fitly be used in due season by all, and more necessarily by some. 4. But it was never intended to be the only words which we must use, no more than the creed is the only words that we must use to express the doctrine of faith, or the decalogue the only words to express our duty by.[57] Quest. II. What need is there of any other words of prayer, if the Lord's prayer be perfect? Answ. Because it is only a perfect summary, containing but the general heads: and it is needful to be more particular in our desires; for universals exist in particulars; and he that only nameth the general, and then another and another general, doth remember but few of the particulars. He that shall say, "I have sinned, and broken all thy commandments," doth generally confess every sin; but it is not true repentance, if it be not particular, for this, and that, and the other sin; at least as to the greater which may be remembered. He that shall say, "I believe all the word of God, or I believe in God the Father, Son, and Holy Ghost," may know little what is in the word of God, or what these generals signify, and therefore our faith must be more particular. So must desires after grace be particular also: otherwise it were enough to ask for mercy in the general. If you say,
  • 19. that God knoweth what those general words signify, though we do not; I answer, this is the papists' silly argument for Latin prayers, God knoweth our desires without any expressions or prayers at all, and he knoweth our wants without our desires. But it followeth not that prayers or desires are unnecessary. The exercise of our own repentance and desire doth make us persons fit to receive forgiveness, and the grace desired; when the impenitent, and those that desire it not, are unfit. And it is no true repentance, when you say, "I am sorry that I have sinned," but you know not, or remember not, wherein you have sinned, nor what your sin is; and so repent not indeed of any one sin at all. And so it is no true desire, that reacheth not to the particular, necessary graces, which we must desire; though I know some few very quick, comprehensive minds can in a moment think of many particulars, when they use but general words; and I know that some smaller, less necessary things, may be generally passed over; and greater matters in a time of haste, or when we, besides those generals, do also use particular requests. Quest. III. Is it lawful to pray in a set form of words? Answ. Nothing but very great ignorance can make you really doubt of it.[58] Hath God any where forbid it? You will say, that it is enough that he hath not commanded it. I answer, that in general he hath commanded it to all whose edification it tendeth to, when he commandeth you, that all be done to edification; but he hath given no particular command, nor prohibition. No more hath he commanded you to pray in English, French, or Latin; nor to sing psalms in this tune or that, nor after this or that version or translation; nor to preach in this method particularly or that; nor always to preach upon a text; nor to use written notes; nor to compose a form of words, and learn them, and preach them after they are composed, with a hundred such like, which are undoubtedly lawful; yea, and needful to some, though not to others. If you make up all your prayer of Scripture sentences, this is to pray in a form of prescribed words, and yet as lawful and fit as any of your own. The psalms are most of them forms of prayer or praise, which the Spirit
  • 20. of God indited for the use of the church, and of particular persons. It would be easy to fill many pages with larger reasonings, and answers to all the fallacious objections that are brought against this; but I will not so far weary the reader and myself. Quest. IV. But are those forms lawful which are prescribed by others, and not by God? Answ. Yea; or else it would be unlawful for a child or scholar to use a form prescribed by his parents or master. And to think that a thing lawful doth presently become unlawful, because a parent, master, pastor, or prince doth prescribe it or command it, is a conceit that I will not wrong my reader so far as to suppose him guilty of. Indeed if an usurper, that hath no authority over us in such matters, do prescribe it, we are not bound to formal obedience, that is, to do it therefore because he commandeth it; but yet I may be bound to it on some other accounts; and though his command do not bind me, yet it maketh not the thing itself unlawful. Quest. V. But is it lawful to pray extempore without a premeditated form of words? Answ. No christian of competent understanding doubteth of it. We must premeditate on our wants, and sins, and the graces and mercies we desire, and the God we speak to; and we must be able to express these things without any loathsome and unfit expressions. But whether the words are fore-contrived or not, is a thing that God hath no more bound you to by any law, than whether the speaker or hearers shall use sermon-notes, or whether your Bibles shall be written or in print. Quest. VI. If both ways be lawful, which is better? Answ. If you are to join with others in the church, that is better to you which the pastor then useth: for it is his office and not yours to word the prayers which he puts up to God. And if he choose a form, (whether it be as most agreeable to his parts, or to his people, or for concord with other churches, or for obedience to governors, or to avoid some greater inconvenience,) you must join with him, or not
  • 21. join there at all.[59] But if it be in private, where you are the speaker yourself, you must take that way that is most to your own edification (and to others, if you have auditors joining with you). One man is so unused to prayer, (being ignorantly bred,) or of such unready memory or expression, that he cannot remember the tenth part so much of his particular wants, without the help of a form, as with it; nor can he express it so affectingly for himself or others; nay, perhaps not in tolerable words. And a form to such a man may be a duty; as to a dim-sighted man to read by spectacles, or to an unready preacher to use prepared words and notes. And another man may have need of no such helps; nay, when he is habituated in the understanding and feeling of his sins and wants, and hath a tongue that is used to express his mind even in these matters, with readiness and facility, it will greatly hinder the fervour of such a man's affections, to tie himself to premeditated words: to say the contrary, is to speak against the common sense and experience of such speakers and their hearers. And let them that yet deride this as uncertain and inconsiderate praying, but mark themselves, whether they cannot if they be hungry beg for bread, or ask help of their physician, or lawyer, or landlord, or any other, as well without a learned or studied form as with it? Who knoweth not that it is true which the new philosopher saith: Cartes. de Passion. part i. art. 44. Et cum inter loquendum solum cogitamus de sensu illius rei, quam dicere volumus, id facit ut moveamus linguam et labra celerius et melius, quam si cogitaremus ea movere omnibus modis requisitis ad proferenda eadem verba; quia habitus quem acquisivimus cum disceremus loqui, &c. Turning the thoughts too solicitously from the matter to the words, doth not only mortify the prayers of many, and turn them into a dead form, but also maketh them more dry and barren even as to the words themselves. The heavy charge, and bitter, scornful words which have been too common in this age, against praying without a set form by some, and against praying with a book or form by others, is so dishonourable a symptom or diagnostic of the church's sickness, as must needs be matter of shame and sorrow to the sounder, understanding part. For it cannot
  • 22. be denied, but it proves men's understandings and charity to be both exceedingly low. Quest. VII. Must we always pray according to the method of the Lord's prayer, and is it a sin to do otherwise? Answ. 1. The Lord's prayer is first a rule for your desires; and it is a sin, if your desires follow not that method. If you do not begin in your desires with God, as your ultimate end, and if you first desire not his glory, and then the flourishing of his kingdom, and then the obeying of his laws, and herein the public welfare of the world, before and above your particular benefit. And it is a sin if you desire not your daily bread, (or necessary support of nature,) as a lower mercy in order to your higher spiritual mercies; and if you desire not pardon of sin, as a means to your future sanctity, duty, and felicity; and if you desire not these, as a means to the glory of God, and take not his praises as the highest part of your prayers. But for the expressing of these desires, particular occasions may warrant you ofttimes to begin in another order: as when you pray for the sick, or pray for directions, or a blessing before a sermon or some particular work, you may begin and end with the subject that is before you, as the prayers of holy men in all ages have done. 2. You must distinguish also, as between desires and expressions, so between a universal and a particular prayer. The one containeth all the parts of prayer, and the other is but about some one subject or part, or but some few; this last being but one or few, particular petitions cannot possibly be uttered in the method of a universal prayer which hath all the parts. There is no one petition in the Lord's prayer, but may be made a prayer itself; and then it cannot have the other petitions as parts. 3. And you must distinguish between the even and ordinary case of a christian, and his extraordinary case, when some special reason, affection, or accident calleth him to look most to some one particular. In his even and ordinary case, every universal prayer should be expressed in the method of the Lord's prayer; but in cases of special reason and inducement it may be otherwise.
  • 23. Quest. VIII. Must we pray always when the Spirit moveth us, and only then, or as reason guideth us? Answ. There are two sorts of the Spirit's motions; the one is by extraordinary inspiration or impulse, as he moved the prophets and apostles, to reveal new laws, or precepts, or events, or to do some actions without respect to any other command than the inspiration itself. This christians are not now to expect, because experience telleth us that it is ceased; or if any should pretend to it as not yet ceased, in the prediction of events, and direction in some things otherwise indifferent, yet it is most certain that it is ceased as to legislation; for the Spirit itself hath already given us those laws, which he hath declared to be perfect, and unchangeable till the end of the world: the other sort of the Spirit's working, is not to make new laws or duties, but to guide and quicken us in the doing of that which is our duty before by the laws already made. And these are the motions that all true christians must now expect. By which you may see, that the Spirit and reason are not to be here disjoined, much less opposed. As reason sufficeth not without the Spirit, being dark and asleep; so the Spirit worketh not on the will but by the reason: he moveth not a man as a beast or stone, to do a thing he knoweth not why; but by illumination giveth him the soundest reason for the doing of it: and duty is first duty before we do it; and when by our own sin we forfeit the special motions or help of the Spirit, duty doth not thereby cease to be duty, nor our omission to be sin. If the Spirit of God teach you to discern the meetest season for prayer, by considering your affairs, and when you are most free, this is not to be denied to be the work of the Spirit, because it is rational (as fanatic enthusiasts imagine). And if you are moved to pray in a crowd of business, or at any time when reason can prove that it is not your duty but your sin, the same reason proveth that it was not the Spirit of God that moved you to it: for the Spirit in the heart is not contrary to the Spirit in the Scripture. Set upon the duty which the Spirit in the Scripture commandeth you, and then you may be sure that you obey the Spirit; otherwise you disobey it. Yea, if your hearts be cold, prayer is a likelier means to warm them, than
  • 24. the omission of it. To ask whether you may pray while your hearts are cold and backward, is as to ask whether you may labour or come to the fire before you are warm. God's Spirit is likelier to help you in duty, than in the neglect of it. Quest. IX. May a man pray that hath no desire at all of the grace which he prayeth for? Answ. No; because it is no prayer, but dissembling; and dissembling is no duty. He that asketh for that which he would not have, doth lie to God in his hypocrisy. But if a man have but cold and common desires, (though they reach not to that which will prove them evidences of true grace), he may pray and express those desires which he hath. Quest. X. May a man pray that doubteth of his interest in God, and dare not call him Father as his child? Answ. 1. There is a common interest in God, which all mankind have, as he is good to all: and as his mercy through Christ is offered to all; and thus those that are not regenerate are his children by creation, and by participation of his mercy; and they may both call him Father and pray to himself, though yet they are unregenerate. [60] 2. God hath an interest in you, when you have no special interest in him: therefore his command must be obeyed which bids you pray. 3. Groundless doubts will not disoblige you from your duty; else men might free themselves from almost all their obedience. Quest. XI. May a wicked or unregenerate man pray, and is he accepted? Or is not his prayer abominable to God? Answ. 1. A wicked man as a wicked man, can pray no how but wickedly, that is, he asketh only for things unlawful to be asked, or for lawful things to unlawful ends; and this is still abominable to God.[61] 2. A wicked man may have in him some good that proceedeth from common grace; and this he may be obliged to exercise, and so by prayer to express his desires so far as they are good. 3. A wicked man's wicked prayers are never accepted, but a wicked man's prayers which are for good things, from common
  • 25. grace, are so far accepted as that they are some means conducing to his reformation; and though his person be still unjustified, and these prayers sinful, yet the total omission of them is a greater sin. 4. A wicked man is bound at once to repent and pray, Acts viii. 22; Isa. lv. 6, 7. And whenever God bids him ask for grace, he bids him desire grace; and to bid him pray, is to bid him repent and be of a better mind: therefore those that reprove ministers for persuading wicked men to pray, reprove them for persuading them to repentance and good desires. But if they pray without that repentance which God and man exhort them to, the sin is theirs: but all their labour is not lost if their desires fall short of saving sincerity; they are under obligations to many duties, which tend to bring them nearer Christ, and which they may do without special, saving grace. Quest. XII. May a wicked man pray the Lord's prayer, or be exhorted to use it? Answ. 1. The Lord's prayer in its full and proper sense, must be spoken by a penitent, believing, justified person;[62] for in the full sense no one else can call him our Father (though in a limited sense the wicked may): and they cannot desire the glory of God, and the coming of his kingdom, nor the doing of his will on earth as it is in heaven, and this sincerely, without true grace (especially those enemies of holiness, that think it too much strictness to do God's will on earth, ten thousand degrees lower than it is done in heaven). Nor can they put up one petition of that prayer sincerely according to the proper sense; no, not to pray for their daily bread, as a means of their support while they are doing the will of God, and seeking first his glory and his kingdom. But yet it is possible for them to speak these words from such common desires as are not so bad as none at all. Quest. XIII. Is it idolatry to pray to saints or angels? or is it always sinful? Answ. I love not to be too quarrelsome with other men's devotions; but, 1. I see not how praying to an angel or a departed saint can be excused from sin.[63] Because it supposeth them to be
  • 26. every where present, or to be omniscient, and to know the heart, yea, to know at once the hearts of all men; or else the speaker pretendeth to know when the saint or angel is present and heareth him, and when not: and because the Scripture doth no where signify that God would have us pray to any such saints or angels; but signifieth enough to satisfy us of the contrary. 2. But all prayer to them is not idolatry, but some is, and therefore we must distinguish, if we will judge righteously. (1.) To pray to saints or angels as supposed omnipresent, omniscient, or omnipotent, is flat idolatry. (2.) To pray to them to forgive us our sins against God, or to justify, or sanctify, or redeem, or save us from hell, or any thing which belongeth to God only to do, is no better than idolatry. (3.) But to pray to them only to do that which belongeth to the guardian, or charitable office that is committed to them, and to think that though they are not omnipresent nor omniscient, nor you know not whether they hear you at this time or not, yet you will venture your prayers at uncertainty, it being but so much labour lost; this I take to be sinfully superstitious, but not idolatry.[64] (4.) But to pray to living saints or sinners, for that which belongeth to them to give, is no sin at all. Quest. XIV. Is a man bound to pray ordinarily in his family? Answ. I have answered this affirmatively before, and proved it; one grain of grace would answer it better than arguments can do. Quest. XV. Must the same man pray secretly that hath prayed in his family or with others? Answ. 1. Distinguish between those that were the speakers, and those that were not; and, 2. Between those that have leisure from greater or more urgent duties, and those that have not. And so, (1.) Those that are free from the urgency of all other duties, which at that time are greater, should pray both in the family and in secret; especially if they were not themselves the speakers, usually they will have the more need of secret prayer; because their hearts in public may easilier flag, and much of their case may be omitted. (2.) But those that have more urgent, greater duties, may take up at that
  • 27. time[65] with family prayer alone (with secret ejaculations, especially if they were the speakers); having there put up the same requests as they would do in secret. Quest. XVI. Is it best to keep set hours for prayer, or to take the time which is fittest at present? Answ. Ordinarily set times will prove the fittest times; and to leave the time undetermined and uncertain, will put all out of order, and multiply impediments, and hinder duty. But yet when extraordinary cases make the ordinary time unfit, a fitter time must be taken. Quest. XVII. Is it lawful to join in family (or church) prayers with ungodly men? Answ. I join both together, because the cases little differ; for the pastor hath the government of the people in church worship, as the master of the family hath in family worship. You may choose at first whether you will be a member of the church or family (if you were not born to it as your privilege); but when you are a member of either, you must be governed as members. And to the case, 1. You must distinguish between professed wicked men, and those that sin against their profession. 2. And between a family (or church) that is totally wicked, and that which is mixed of good and bad. 3. And between those wicked men whose presence is your sin, because you have power to remove them, and those whose presence is not your sin, nor the matter in your power. 4. And between one that may yet choose of what family he will be, and one that may not. And so I answer, (1.) If it be the fault of the master of the family (or the pastors of the church) that such wicked men are there, and not cast out, then it is their sin to join with them, because it is their duty to remove them; but that is not the case of the fellow-servants, (or people,) that have no power. (2.) If that wicked men profess their wickedness, after sufficient admonition, you must professedly disown communion with them; and then you are morally separated and discharged, when you have no power locally to separate. (3.) It is your sin to fly from your duty, because a wicked man is there, whom you have no power to remove. (4.) There are many prayers
  • 28. that a wicked man is bound to put up to God; and you must not omit your duty, because he performeth his, though faultily; methinks you should more scruple joining or conversing with one that forsaketh prayer (which is the greater sin) than with one that prayeth. (5.) But if you are free to choose, you are to be blamed if you will not choose a better family (or church) (other things being equal): especially if all the company be wicked. Quest. XVIII. But what if the master of a family (or pastor) be a heretic or ungodly? Answ. You must distinguish between his personal faults, and the faults of his performance or worship. His personal faults (such as swearing or drunkenness, &c.) you must disown, and must not choose a master (or pastor) that is such, while you have your choice, and may have better; but otherwise it is lawful to join with him in doing good, though not in evil. But if the fault of his duty itself be intolerable you must not join with him. Now it is intolerable in these cases: 1. In case he be utterly unable to express a prayer, and so make it no prayer. 2. In case he bend his prayers against godliness, and known truth, and charity, and peace, and so make his prayers but the instruments of mischief, to vent heresy, or malice, and do more hurt than good to others. Quest. XIX. May we pray absolutely for outward mercies, or only conditionally? Answ. You must distinguish, 1. Between a condition spoken of the subject, when we are uncertain whether it be a mercy or not, and an extrinsic condition of the grant. 2. Between a condition of prayer, and a condition of expectation. 3. Between submission to God's will, and a conditional desire or prayer. And so I answer, (1.) It is necessary when we are uncertain whether the thing itself be good or not, that we pray with a subjective conditionality: Grant this if it be good; or, If it be not good I do not pray for it. For it is presupposed in prayer that we know the thing prayed for to be good. (2.) But when we know the thing to be a mercy and good, we may pray for it absolutely. (3.) But we may not believe that we shall receive all with
  • 29. an absolute expectation, which we absolutely pray for. For prayer being the expression of desire, that which may be absolutely desired, though not absolutely promised, may be absolutely prayed for. (As our increase or strength of grace, or the conversion of our relations, &c.) (4.) But yet all such must be asked with a submission to the will of God: but that maketh it not properly a conditional form of praying; for when the nature of prayer is as it were to move the will of God, it is not so proper to say, Lord, do this if it be thy will already; or, Lord, be pleased to do this if it be thy pleasure; as to say, Lord, grant this mercy; but if thou deny it, it is my duty to submit. So Christ mentioned both the subjective conditionality and the submission of his will. Matt. xxvi. 39, "If it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt." As if he had said, Nature requireth me with a simple nolition to be unwilling of the suffering, and if it be consistent with the desired ends of my mediatorship, to be desirous to avoid it; but seeing that cannot be, my comparing will commandeth this simple will of self- preservation to submit to thy most perfect will. But if any call this (submission) a condition, the matter is not great. Quest. XX. May we pray for all that we may lawfully desire? Answ. No: for prayer is not only an expression of desire, but also a means to attain the thing desired. And some things may be lawfully desired, (at least with a simple velleity,) which may not be sought, because they must not be hoped for, where God hath said that he will not grant them. For it is vain to seek that which you have no hope to find: as to desire to see the conversion of the whole world, or to pass to heaven as Enoch without dying, are lawful (by a simple velleity); but all things compared, it is not lawful peremptorily to desire it, without submission; and therefore not to ask it. It is the expression of a comparate, determinate desire, which is properly called prayer, being the use of means for the obtaining of that desire; and whatsoever I may so desire, I may pray for; for if there be no hope of it, I may not so desire it. But the desire by way of simple velleity may not be put into a proper prayer, when there is no hope. I must have a simple desire (with submission) to attain a
  • 30. sinless perfection here, even this hour; but because there is no hope, I may not let it proceed to a determinate peremptory desire upon a comparing judgment, nor into a proper prayer. And yet these velleities may be expressed in prayer, though they have not the full nature of a prayer. Object. But was not Christ's a prayer? Matt. xxvi. 39. Answ. Either Christ as man was certain that the cup must not pass from him, or uncertain. If you could prove him uncertain, then it is a proper prayer (with submission to his Father's will); but if he was certain that it was not to pass from him, then it was analogically only a prayer, it being but a representing of his velleity to his Father, and not of his determinate will, nor was any means to attain that end: and indeed such it was, as if he had said, Father, if it had stood with the ends of my office and thy will, I would have asked this of thee; but because it doth not, I submit. And this much we may do. Quest. XXI. How then can we pray for the salvation of all the world? must it be for all men collectively? or only for some, excluding no numerical denominate person? Answ. Just as Christ prayed here in this text, we must express our simple velleity of it to God, as a thing that in itself is most desirable (as the passing of the cup was unto Christ): but we cannot express a determinate volition, by a full prayer, such as has any tendency as a means to attain that end; because we are certain that God's will is against it, or that it will not be. Quest. XXII. May we pray for the conversion of all the nations of the world to christianity, with a hopeful prayer? Answ. Yes: For we are not certain that every nation shall not be so converted, though it be improbable. Quest. XXIII. May we pray in hope with a proper prayer (as a means to obtain it) that a whole kingdom may be all truly converted and saved? Answ. Yes: for God hath no way told us that it shall not be; though it be a thing improbable, it is not impossible; and therefore
  • 31. being greatly desirable may be prayed for. Though Christ has told us that his flock is little, and few find the way of life, yet that may stand with the salvation of a kingdom. Quest. XXIV. May we pray for the destruction of the enemies of Christ, or of the gospel, or of the king? Answ. Not with respect to that which is called God's antecedent will, for so we ought first to pray for their conversion (and restraint till then); but with respect to that called his consequent will we may; that is, we must first pray that they may be restrained and converted, and secondly, that if not, they may be destroyed. Quest. XXV. What is to be thought of that which some call a particular faith in prayer? If I can firmly believe that a lawful prayer shall be granted in kind, may I not be sure by a divine faith that it shall be so? Answ. Belief hath relation to a testimony or revelation. Prayer may be warranted as lawful, if the thing be desirable, and there be any possibility of obtaining it, though there be no certainty, or flat promise; but faith or expectation must be warranted by the promise. If God have promised you the thing prayed for, you may believe that you shall receive it: otherwise your particular faith is a fancy, or a believing of yourselves, and not a believing God that never promised you the thing. Object. Matt. xxi. 22, "And all things whatsoever you ask in prayer, believing, ye shall receive."[66] Answ. There are two sorts of faith: the one a belief that is ordinary, having respect to ordinary promises and mercies: the text can be understood of this in no other sense than this: All things which I have promised you, you shall receive, if you ask them believingly. But this is nothing to that which is not promised. The other faith was extraordinary, in order to the working of miracles: and this faith was a potent inward confidence, which was not in the power of the person when he pleased, but was given like an inspiration by the Spirit of God, when a miracle was to be wrought; and this seemeth to be it that is spoken of in the text. And this was built on this extraordinary promise, which was made not to all men in all ages, but to those
  • 32. times when the gospel was to be sealed and delivered by miracles; and especially to the apostles. So that in these times, there is neither such a promise of our working miracles as they had to believe, nor yet a power to exercise that sort of extraordinary faith. Therefore a strong conceit (though it come in a fervent prayer) that any thing shall come to pass, which we cannot prove by any promise or prophecy, is not to be called any act of divine faith at all, nor to be trusted to. Quest. XXVI. But must we not believe that every lawful prayer is accepted and heard of God? Answ. Yes: but not that it should be granted in the very thing, unless so promised: but you may believe that your prayer is not lost, and that it shall be a means of that which tendeth to your good, Rom. viii. 28; Isa. xlv. 19. Quest. XXVII. With what faith must I pray for the souls or bodies of other men; for their conversion or their lives? Answ. A godly man may pray for wicked relations or others, with more hope than they can pray for themselves, while they remain ungodly: but yet not with any certainty of prevailing for the thing he asketh; for it is not peremptorily promised him. Otherwise Samuel had prevailed for Saul, and Isaac for Esau, and David for Absalom, and the good people for all the wicked; and then no godly parents would have their children lost; no, nor any in the world would perish, for godly persons pray for them all. But those prayers are not lost to him that puts them up. Quest. XXVIII. With what faith may we pray for the continuance of the church and gospel to any nation? Answ. The former answer serveth to this; our hope may be according to the degrees of probability: but we cannot believe it as a certainty by divine faith, because it is not promised by God. Quest. XXIX. How may we know when our prayers are heard of God, and when not?
  • 33. Answ. Two ways: sometimes by experience, when the thing itself is actually given us; and always by the promise; when we ask for that which God commandeth us to ask, or promiseth to grant; for we are sure God's promises are all fulfilled. If we ask for the objects of sense (as food or raiment, or health, &c.) sense will tell us whether our prayers be granted in the same kind that we asked for; but if the questions be of the objects of faith, it is faith that must tell you that your prayers are granted; but yet faith and reason make use of evidences or signs. As if I pray for pardon of sin, and salvation, the promise assureth me, that this prayer is granted, if I be a penitent, believing, regenerate person, otherwise not; therefore faith only assureth me that such prayers are granted, supposing that I discern the evidence of my regeneration, repentance, and faith in Christ. So if the question be whether my prayer for others, or for temporal mercies, be answered in some other kind, and conduce to my good some other way, faith only must tell you this from the promise, by the help of evidences. There are millions of prayers that will all be found answered at death and judgment, which we knew not to be answered any way but by believing it. Quest. XXX. What should a christian of weak parts do, that is dry and barren of matter, and can scarce tell what to say in prayer, but is ready to rise off his knees almost as soon as he hath begun?
  • 34. How to have constant supply of matter. Answ. 1. He must not be a stranger to himself, but study well his heart and life: and then he will find such a multitude of inward corruptions to lament, and such a multitude of wants to be supplied, and weaknesses to be strengthened, and disorders to be rectified, and actual sins to be forgiven, that may find him work enough for confessions, complaints, and petitions many days together, if expression be but as ready as matter. 2. Let him study God, and get the knowledge of his nature, attributes, and works: and then he will find matter enough to aggravate his sin, and to furnish him with the holy praise of God from day to day. As he that is acquainted with all that is in any book, can copiously discourse of it, when he that knoweth not what is in it, hath little to say of it; so he that knoweth God and his works (and himself, and his sins and wants) is acquainted with the best prayer book, and hath always a full heap of matter before him, whenever he cometh to speak to God. 3. Let him study the mystery of man's redemption, and the person, and office, and covenant, and grace of Christ; and he need not want matter for prayer or praise. A very child, if he sees but a pedlar's pack opened, where there are abundance of things which he desireth, will learn without book to say, O father, buy me this, and give me that, &c. So will the soul that seeth the treasures and riches of Christ.[67] 4. Let him know the extent of the law of God, and the meaning of the ten commandments: if he know but what sins are forbidden in each commandment, and what duties are required, he may find matter enough for confession and petition: and therefore the view of such a brief exposition of the commandments, as you may find in Mr. Brinsley's "True Watch," and in Dr. Downam's and Mr. Whateley's "Tables," will be a present furniture for such a use, especially in days of humiliation. So it will also to have a particular understanding of the creed and the Lord's prayer, which will furnish you with much matter. 5. Study well the temptations which you carry about you in your flesh, and meet with in the world, and are suggested by the tempter; and think of the many duties you have to do, and the many dangers and sufferings to undergo, and you will
  • 35. How to keep up fervency in prayer. never be unfurnished for matter for your prayers. 6. Observe the daily passages of providence, to yourselves and others; mark how things go with your souls every day, and hearken how it goeth with the church of God, and mark also how it goeth with your neighbours, and sure you will find matter enough for prayer. 7. Think of the heavenly joys that you are going to, and the streets of the New Jerusalem will be large enough for faith to walk in. 8. For words, be acquainted with the phrase of Scripture, and you will find provisions for all occasions. Read Dr. Wilkins's book, called "The gift of Prayer," or Mr. Brinsley's "Watch," or Mr. E. Parr's "Abba, Father." 9. Keep up the heart in a reverent, serious, lively frame, and it will be a continual spring to furnish you with matter; when a dead and barren heart hath a dry and sleepy tongue. 10. Join as often as you can with those that are full and copious in prayer; for example and use will be very great helps. 11. Quench not the Spirit of God that must assist you. 12. In case of necessity, use those books or forms which are more full than you can be yourselves till you come to ability to do better without them. Read further the directions part i. chap. vi. tit. 2, for more. Quest. XXXI. How should a christian keep up an ordinary fervency in prayer? Answ. 1. See that knowledge and faith provide you matter; for as the fire will go out if there be not fuel, so fervency will decay when you are dry, and scarce know what to say, or do not well believe what you understand. 2. Clog not the body either with over-much eating and drinking, or over-tiring labours; for an active body helpeth much the activity of the mind; and the holiest person will be able but poorly to exercise his fervency, under a dull or languishing body. 3. Rush not suddenly upon prayer, out of a crowd of other businesses, or before your last worldly cares or discourses be washed clean out of your minds. In study and prayer how certain a truth is it, that Non bene fit quod occupato animo fit. Hieron. Epist. 143. ad Paulin. That work is not well done, which is done with a mind that is prepossessed, or busied about other matters: that mind must be wholly free from all
  • 36. other present thoughts or business, that will either pray or study well. 4. Keep a tender heart and conscience that is not senseless of your own concernments; for all your prayers must needs be sleepy, if the heart and conscience be once hardened, seared, or fallen asleep. 5. Take more pains with your hearts than with your tongues. Remember that the success of your work lieth most on them. Bear not with their sluggishness; do by them as you would do by your child or servant that sleepeth by you at prayer; you will not let them snort on, but jog them till you have awakened them. So do by your hearts when you find them dull. 6. Live as in the continual presence of God; but labour to apprehend his special presence when you are about to speak to him: ask your hearts how they would behave themselves, if they saw the Lord, or but the lowest of his holy angels? 7. Let faith be called up to see heaven and hell as open all the while before you; and such a sight will surely keep you serious. 8. Keep death and judgment in your continual remembrance and expectation: remember how all your prayers will be looked back upon. Look not for long life: remember that this prayer for aught you know may be your last; but certainly you have not long to pray: pray therefore as a dying man should do. 9. Study well the unspeakable necessity of your souls. If you prevail not for pardon, and grace, and preservation, you are undone and lost for ever. Remember that necessity is upon you, and heaven or hell are at the end, and you are praying for more than a thousand lives. 10. Study well the unspeakable excellency of those mercies which you pray for: O think how blessed a life it would be, if you could know God more, and love him more, and live a blameless, heavenly life, and then live with Christ in heaven for ever! Study these mercies till the flames of love put life into your prayers. 11. Study well the exceeding encouragements that you have to pray and hope; if your hope decay your fervour will decay. Think of the unconceivable love of God, the astonishing mercy showed to you in your Redeemer, and in the helps of the Holy Spirit, and how Christ is now interceding for you. Think of these till faith make glad your heart; and in this gladness, let praise and thanksgiving have ordinarily no small share in your prayers; for it will tire out the heart to be always poring on its own
  • 37. distempers, and discourage it to look on nothing but its infirmities; and then, a sad, discouraged temper will not be so lively a temper, as a thankful, praiseful, joyful temper is: for lætitia loquax res est, atque ostentatrix sui; Gladness is a very expressive thing, and apt to show itself.[68] But tristes non eloquentes sunt: maxime si ad ægritudinem animi accedat corporis ægritudo. Hieron. Epist. 31. ad Theoph. Alexand. Sad men are seldom eloquent; especially if the body be sick as well as the mind. 12. Let the image of a praying and a bleeding Christ, and of his praying saints, be (not on a wall before your eyes, but) engraven on your minds. Is it not desirable to be conformed to them? Had they more need to pray importunately than you? 13. Be very cautelous in the use of forms, lest you grow dull and customary, and before you are aware your tongues use to go without your hearts. The heart is apt to take its ease when it feeleth not some urgent instigation. And though the presence of God should serve the turn without the regard of man, yet with imperfect men the heart is best held to its duty when both concur. And therefore most are more cautelous of their words, than of their thoughts; as children will learn their lesson better, when they know their masters will hear them it, than when they think he will not. Now in the use of a form of prayer, a sleepy heart is not at all discerned by man, but by God only; for the words are all brought to your hand, and may be said by the most dull and careless mind; but when you are put to express your own desire, without such helps, you are necessitated to be so mindful of what you do, as to form your desires into apt expressions, or else your dulness or inattentiveness will be observed even by men; and you will be like one that hath his coach, or horse, or crutches taken off him, that if he have legs must use them, or else lie still. And to them that are able, it is often a great benefit to be necessitated to use the ability they have; though to others it is a loss to be deprived of their helps.[69] I speak not this against the lawfulness of a form of prayer; but to warn you of the temptations which are in that way. 14. Join oft with the most serious, fervent christians; for their fervour will help your hearts to burn, and carry you along with them. 15. Destroy not fervency by adulterating it,
  • 38. and turning it into an affected earnestness of speech, and loudness of voice, when it is but a hypocritical cover for a frozen, empty heart. Quest. XXXII. May we look to speed ever the better for any thing in ourselves, or in our prayers? Is not that to trust in them, when we should trust on Christ alone? Answ. We must not trust in them for any thing that is Christ's part and not theirs; but for their own part it is a duty to trust in them (however quarrelsome persons may abuse or cavil at the words): and he that distrusteth prayer in that which is its proper office, will pray to little purpose: and he that thinks that faithful, fervent, importunate, understanding prayer, is no more effectual with God for mercy, than the babbling of the hypocrite, or the ignorant, careless, unbelieving, sleepy prayers of the negligent, will either not care how he prayeth, or whether he prayeth at all or not. Though our persons and prayers have nothing that is meritorious with God, in point of commutative justice, nor as is co-ordinate with the merits of Christ, yet have they conditions without which God will not accept them, and are meritorious in subordination to the merit of Christ, in point of paternal governing justice according to the covenant of grace; as an obedient child deserveth more love, and praise, and reward from his father than the disobedient: as the ancient fathers commonly used the word merit.[70] Quest. XXXIII. How must that person and prayer be qualified that shall be accepted of God? Answ. There are several degrees of God's acceptance. I. That which is but from common grace, may be accepted as better than none at all. II. That which hath a promise of some success, especially as to pardon and salvation, must be, 1. From a penitent, believing, holy person. 2. It must proceed from true desire, and be sincere; and have renewed faith and repentance in some measure. 3. It must be put up in confidence on the merit and intercession of Christ. 4. It must be only for things lawful. 5. And to a lawful end. III. That which is extraordinarily accepted and successful, must be
  • 39. extraordinary in all these respects; in the person's holiness, and in renewed faith and fervent importunity, and holy love. Tit. 3. Special Directions for Family Prayer. Direct. I. Let it be done rather by the master of the family himself than any other, if he be competently able, though others be more able; but if he be utterly unfit, let it rather be done by another than not at all; and by such an one as is most acceptable to the rest, and like to do most good. Direct. II. Let prayer be suited to the case of those that join in it, and to the condition of the family; and not a few general words spoken by rote, that serve all times and persons alike. Direct. III. Let it neither be so short as to end before their hearts can be warm and their wants expressed (as if you had an unwilling task to slubber over, and would fain have done); nor yet so tedious as to make it an ungrateful burden to the family. Direct. IV. Let not the coldness and dulness of the speaker rock the family asleep; but keep awake your own heart, that you may keep the rest awake, and force them to attention. Direct. V. Pray at such hours as the family may be least distracted, sleepy, tired, or out of the way. Direct. VI. Let other duties concur, as oft as may be, to assist in prayer: as reading, and singing psalms. Direct. VII. Do all with the greatest reverence of God that possibly you can; not seeming reverence, but real; that so more of God than of man may appear in every word you speak. Direct. VIII. The more the hearers are concerned in it, the more regard you must have to the fitness of your expressions; for before others, words must be regarded, lest they be scandalized, and God and prayer be dishonoured. And if you cannot do it competently without, use a well-composed form.
  • 40. Direct. IX. Let not family prayer be used at the time of public prayer in the church, nor preferred before it, but prefer public prayer, though the manner were more imperfect than your own. Direct. X. Teach your children and servants how to pray themselves, that they may not be prayerless when they come among those that cannot pray. John and Christ taught their disciples to pray. Tit. 4. Special Directions for Secret Prayer. Direct. I. Let it be in as secret a place as conveniently you can; that you may not be disturbed. Let it be done so that others may not be witnesses of it, if you can avoid it; and yet take it not for your duty, to keep it unknown that you pray secretly at all: for that will be a snare and scandal to them. Direct. II. Let your voice be suited to your own help and benefit, if none else hear you. If it be needful to the orderly proceeding of your own thoughts, or to the warming of your own affections, you may use a voice; but if others be within hearing, it is very unfit. Direct. III. In secret let the matter of your prayers be that which is most peculiarly your own concernment, or those secret things that are not fit for public prayer, or are there passed by; yet never forgetting the highest interest of Christ, and the gospel, and the world and church. Direct. IV. Be less solicitous about words in secret than with others, and lay out your care about the heart; for that is it that God most esteemeth in your prayers. Direct. V. Do not through carnal unwillingness grow into a neglect of secret prayer, when you have time; nor yet do you superstitiously tie yourselves to just so long time, whether you are fit, or at leisure from greater duties, or not. But be the longer when you are most fit and vacant, and the shorter when you are not. To give way to every carnal backwardness, is the sin on one side; and to resolve to spend so long time, when you do but tire yourselves, and sleep, or
  • 41. business, or distemper maketh it a lifeless thing, is a sin on the other side. Avoid them both. Direct. VI. A melancholy person who is unfit for much solitariness and heart-searchings, must be much shorter, if not also seldomer in secret prayers, than other christians that are capable of bearing it: and they must, instead of that which they cannot do, be the more in that which they can do; as in joining with others, and in shorter ejaculations, besides other duties; but not abating their piety in the main upon any pretence of curing melancholy. FOOTNOTES [53] The Stoics say, Orabit sapiens ac vota faciet bona à diis postulans. Laert. in Zenone. So that when Seneca saith, Cur Deos precibus fatigatis, &c. he only intendeth to reprove the slothful, that think to have all done by prayer alone, while they are idle and neglect the means. [54] Plerumque hoc negotium plus genscibus quam sermonibus agitur. August. Epist. 121. [55] Bias navigabat aliquando cum impiis, et quum navis tempestate, quateretur, illique Deos invocarent; silete, inquit, ne vos hic illi navigare sentiant. Laert. p. 55. [56] Of the method of the Lord's Prayer, see Ramus de Relig. Christ. lib. iii. cap. 3. et Ludolphus de Vita Christi, part i. cap. 37. et Perkins in Orat. Dom. and Dr. Boys on the Liturgy, p. 5-7. [57] Selden in Eutychii Alexandr. Orig. p. 42, 43, showeth that before Ezra the Jews prayed without forms, and that Ezra and the elders with him, composed them a form which had eighteen benedictions and petitions, that is, the three first and the three last for the glorifying God, and the rest intermediate for personal and public benefits. And, pag. 48, that they might omit none of these, but might add others.
  • 42. [58] See Selden ubi supra, proving that the Jews had a form of prayer since Ezra's time; therefore it was in Christ's time. Yet he and his apostles joined with them, and never contradicted or blamed them for forms. [59] Three or four of these cases as to church prayers are largelier answered afterward, part iii. Socrates alius Cous deorum precationes, invocationesque conscripsit. Laert. in Socrate. [60] Psal. xlii. 9; xxii. 1; John ii. 14; Jer. xxxi. 9; Luke xv. 12, 17, 19; Mal. ii. 10. [61] Acts xv. 17; xvii. 27; viii. 22; Isa. lv. 6; Psal. xiv. 4. [62] Heb. xi. 6; Rom. x. 14. [63] Psal. lxv. 2; Isa. lxiii. 16; Psal. cxlv. 18; 1 Kings viii. 39; Acts i. 24; Rom. viii. 27; x. 14; Psal. lxii. 8; Matt. iv. 9. [64] Rev. xxii. 8, 9; Col. ii. 18. [65] Mark that I say but "at that time." [66] Mark xi. 23, 24. [67] Rev. iii. 17, 18. [68] Symmach. Epist. 31. 1. 1. ad Auson. [69] See Mr. Mayo's Directions on this case. [70] See my "Confession" of this at large.
  • 43. What are the ends of the sacrament? CHAPTER XXIV. BRIEF DIRECTIONS FOR FAMILIES, ABOUT THE SACRAMENT OF THE BODY AND BLOOD OF CHRIST. Omitting those things which concern the public administration of this sacrament, (for the reasons before intimated part ii.) I shall here only give you some brief directions for your private duty herein. Direct. I. Understand well the proper ends to which this sacrament was instituted by Christ; and take heed that you use it not to ends for which it never was appointed. The true ends are these: 1. To be a solemn commemoration of the death and passion of Jesus Christ, to keep it, as it were, in the eye of the church, in his bodily absence till he come, 1 Cor. xi. 24-26. 2. To be a solemn renewing of the holy covenant which was first entered in baptism, between Christ and the receiver; and in that covenant it is, on Christ's part, a solemn delivery of himself first, and with himself the benefits of pardon, reconciliation, adoption, and right to life eternal. And on man's part, it is our solemn acceptance of Christ with his benefits, upon his terms, and a delivering up of ourselves to him, as his redeemed ones, even to the Father as our reconciled Father, and to the Son as our Lord and Saviour, and to the Holy Spirit as our Sanctifier, with professed thankfulness for so great a benefit. 3. It is appointed to be a lively objective means, by which the Spirit of Christ should work to stir up, and exercise, and increase the repentance, faith, desire, love, hope, joy, thankfulness, and new obedience of believers; by a lively representation of the evil of sin, the infinite love of God in Christ, the firmness of the covenant or promise, the greatness and sureness of the mercy given, and the blessedness purchased and promised to us, and the great obligations that are laid upon us.[71] And that herein believers might be solemnly called out to the most
  • 44. serious exercise of all these graces, and might be provoked and assisted to stir up themselves to this communion with God in Christ, and to pray for more as through a sacrificed Christ.[72] 4. It is appointed to be the solemn profession of believers, of their faith, and love, and gratitude, and obedience to God the Father, Son, and Holy Ghost, and of continuing firm in the christian religion. And a badge of the church before the world. 5. And it is appointed to be a sign and means of the unity, love, and communion of saints, and their readiness to communicate to each other. The false, mistaken ends which you must avoid are these: 1. You must not, with the papists, think that the end of it is to turn bread into no bread, and wine into no wine, and to make them really the true body and blood of Jesus Christ. For if sense (which telleth all men that it is still bread and wine) be not to be believed, then we cannot believe that ever there was a gospel, or an apostle, or a pope, or a man, or any thing in the world. And the apostle expressly calleth it bread three times, in three verses together, after the consecration, 1 Cor. xi. 26-28. And he telleth us, that the use of it is (not to make the Lord's body really present, but) "to show the Lord's death till he come;" that is, as a visible representing and commemorating sign, to be instead of his bodily presence till he come. 2. Nor must you with the papists use this sacrament to sacrifice Christ again really unto the Father, to propitiate him for the quick and dead, and ease souls in purgatory, and deliver them out of it. For Christ having died once dieth no more, and without killing him there is no sacrificing him. By once offering up himself, he hath perfected for ever them that are sanctified, and now there remaineth no more sacrifice for sin: having finished the sacrificing work on earth, he is now passed into the heavens, to appear before God for his redeemed ones.[73] 3. Nor is it any better than odious impiety to receive the sacrament, to confirm some confederacies or oaths of secrecy, for
  • 45. rebellions or other unlawful designs; as the powder-plotters in England did. 4. Nor is it any other than impious profanation of these sacred mysteries, for the priest to constrain or suffer notoriously ignorant and ungodly persons to receive them;[74] either to make themselves believe that they are indeed the children of God, or to be a means which ungodly men should use to make them godly, or which infidels or impenitent persons must use to help them to repentance and faith in Christ. For though there is that in it which may become a means of their conversion, (as a thief that stealeth a Bible or sermon book, may be converted by it,) yet is it not to be used by the receiver to that end. For that were to tell God a lie, as the means of their conversion; for whosoever cometh to receive a sealed pardon, doth thereby profess repentance, as also by the words adjoined he must do; and whosoever taketh, and eateth, and drinketh the bread and wine, doth actually profess thereby, that he taketh and applieth Christ himself by faith: and therefore, if he do neither of these, he lieth openly to God: and lies and false covenants are not the appointed means of conversion. Not that the minister is a liar in his delivery of it: for he doth but conditionally seal and deliver God's covenant and benefits to the receiver, to be his, if he truly repent and believe: but the receiver himself lieth, if he do not actually repent and believe, as he there professeth to do. 5. Also it is an impious profanation of the sacrament, if any priest, for the love of filthy lucre, shall give it to those that ought not to receive it, that he may have his fees or offerings; or, that the priest may have so much money that is bequeathed for saying a mass for such or such a soul. 6. And it is an odious profanation of the sacrament, to use it as a league or bond of faction, to gather persons into the party, and tie them fast to it, that they may depend upon the priest, and his faction and interest may thereby be strengthened, and he may seem to have many followers.
  • 46. What are the parts of the sacraments? 7. And it is a dangerous abuse of it, to receive it, that you may be pardoned, or sanctified, or saved, barely by the work done, or by the outward exercise alone. As if God were there obliged to give you grace, while you strive not with your own hearts, to stir them up to love, or desire, or faith, or obedience, by the means that are before you; or, as if God would pardon and save you for eating so much bread and drinking so much wine, when the canon biddeth you; or, as if the sacrament conveyed grace, like as charms are supposed to work, by saying over so many words. 8. Lastly, It is no appointed end of this sacrament, that the receiver thereby profess himself certain of the sincerity of his own repentance and faith (for it is not managed on the ground of such certainty only by the receiver; much less by the minister that delivereth it). But only he professeth, that as far as he can discern by observing his own heart, he is truly willing to have Christ and his benefits, on the terms that they are offered; and that he doth consent to the covenant which he is there to renew. Think not therefore that the sacrament is instituted for any of these (mistaken) ends. Direct. II. Distinctly understand the parts of the sacrament, that you may distinctly use them, and not do you know not what. This sacrament containeth these three parts. 1. The consecration of the bread and wine, which maketh it the representative body and blood of Christ. 2. The representation and commemoration of the sacrifice of Christ. 3. The communion: or, communication by Christ, and reception by the people. 1. In the consecration, the church doth first offer the creatures of bread and wine, to be accepted of God, to this sacred use. And God accepteth them, and blesseth them to this use; which he signifieth both by the words of his own institution, and by the action of his ministers, and their benediction. They being the agents of God to the people in this accepting and blessing, as they are the agents of the people to God, in offering or dedicating the creatures to this use.
  • 47. This consecration having a special respect to God the Father, in it we acknowledge his three grand relations. 1. That he is the Creator, and so the Owner of all the creatures; for we offer them to him as his own. 2. That he is our righteous Governor, whose law it was that Adam and we have broken, and who required satisfaction, and hath received the sacrifice and atonement, and hath dispensed with the strict and proper execution of that law, and will rule us hereafter by the law of grace. 3. That he is our Father or Benefactor, who hath freely given us a Redeemer, and the covenant of grace, whose love and favour we have forfeited by sin, but desire and hope to be reconciled by Christ. As Christ himself was incarnate and true Christ, before he was sacrificed to God, and was sacrificed to God before that sacrifice be communicated for life and nourishment to souls; so in the sacrament, consecration must first make the creature to be the flesh and blood of Christ representative; and then the sacrificing of that flesh and blood must be represented and commemorated; and then the sacrificed flesh and blood communicated to the receivers for their spiritual life. II. The commemoration chiefly (but not only) respecteth God the Son. For he hath ordained, that these consecrated representations should in their manner and measure, supply the room of his bodily presence, while his body is in heaven; and that thus, as it were, in effigy, in representation, he might be still crucified before the church's eyes; and they might be affected, as if they had seen him on the cross. And that by faith and prayer, they might, as it were, offer him up to God; that is, might show the Father that sacrifice, once made for sin, in which they trust, and for which it is that they expect all the acceptance of their persons with God, and hope for audience, when they beg for mercy, and offer up prayer or praises to him. III. In the communication, though the sacrament have respect to the Father, as the principal Giver, and to the Son, as both the Gift and Giver, yet hath it a special respect to the Holy Ghost, as being
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