5 Counsel in a man's heart is deep water, but a prudent man will draw it out.
Proverbs 20:5 Cross References - CAB
Psalms 64:6
6 They have searched out iniquity; they have wearied themselves with searching diligently, a man shall approach and the heart is deep,
Proverbs 18:4
4 A word in the heart of a man is a deep water, and a river and fountain of life spring forth.
1 Corinthians 2:11
11 For who among men knows the things of a man, except the spirit of the man which is in him? Even so, no one knows the things of God except the Spirit of God.