1) The document contrasts the legacies of King Asa and the Apostle Paul, who both started well but finished differently. Asa started by purging idolatry but later disobeyed God, while Paul went from persecuting Christians to being martyred for spreading the gospel.
2) It argues that one's legacy is determined not by how they started, but by how they finish following God. It encourages taking steps daily to finish well like Paul rather than finishing badly by abandoning faith like Asa.
3) The conclusion asks what legacy the reader will leave by how they finish their journey with God.