To trust the Lord with all your heart means completely relying on God rather than one's own understanding or strength. It requires giving all aspects of oneself to follow God's will as revealed by the Holy Spirit. This allows God to work through people to fulfill his perfect plans and bring him glory. Leaning on one's own understanding means not logically problem-solving but trusting God fully. Living this way results in God blessing those who obey him by using them to accomplish his will.