and lean not unto thine own understanding; or trust not to that; for it stands opposed to trusting in the Lord. Men should not depend upon their own wisdom and understanding, in the conduct of civil life, but should seek the direction and blessing of Providence, or otherwise will meet with disappointment; and, when they succeed, should ascribe it not to their own prudence and wisdom, but to the goodness of God; for "bread" is not always "to the wise, nor riches to men of understanding", Ecclesiastes 9:11; and much less should men lean to their own understanding in matters of religion; a natural man has no understanding of spiritual things, of the things of the Gospel, nor indeed any practical understanding of things moral, Romans 3:11, Jeremiah 4:22. The understanding of man is darkened by sin; yea, is darkness itself; it is like the first earth, covered with darkness, till light is let into it, and therefore not to be leaned unto and depended on, Ephesians 4:18. There is a necessity of a new heart and spirit, of an understanding to be given, in order to understand spiritual and divine things, Ezekiel 36:26; for though these are not contrary to the reason and understanding of men; yet they are above them, and cannot be discovered, reached, comprehended, and accounted for by them, Matthew 16:17. Nay, there are some things in the Gospel, which, though plain to an enlightened understanding by the word of God, yet the manner how they are cannot be apprehended: as the doctrines of a trinity of Persons; of the generation of the Son of God; the procession of the Spirit; the union of the two natures in Christ; the resurrection of the dead, &c. In short, not our reason and understanding at best, and much less as carnal and unsanctified, but the word of God only is our rule of judgment, and the standard of our faith and practice; and to that we should have recourse and be directed by it, and not lean to our own understandings.