Proverbs 20:5

Deep waters [are like] purpose in the heart of a man, and a man of understanding will draw it out.

Psalm 64:6

{They carefully plot} injustices [saying], "We have perfected {the perfect plot}!" Both [the] {inner thought} and heart of man [are] deep.

Proverbs 18:4

Deep waters [are] words of the mouth of a man; a gushing stream [is] a fountain of wisdom.

1 Corinthians 2:11

For who among men knows the things of a man, except the spirit of the man that [is] in him? Thus also no one knows the things of God except the Spirit of God.

Treasury of Scripture Knowledge

Summary

Counsel in the heart of man is like deep water; but a man of understanding will draw it out.

Bible References

General references

Proverbs 18:4
Deep waters [are] words of the mouth of a man; a gushing stream [is] a fountain of wisdom.
Psalm 64:6
{They carefully plot} injustices [saying], "We have perfected {the perfect plot}!" Both [the] {inner thought} and heart of man [are] deep.
1 Corinthians 2:11
For who among men knows the things of a man, except the spirit of the man that [is] in him? Thus also no one knows the things of God except the Spirit of God.