Proverbs 20:5

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

Psalm 64:6

They search out iniquities; they accomplish a diligent search: both the inward thought of every one of them, and the heart, are deep.

Proverbs 18:4

The words of a man's mouth are like deep waters, and the wellspring of wisdom like a flowing brook.

1 Corinthians 2:11

For what man knows the things of a man, except the spirit of man which is in him? even so the things of God knows no man, but 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
The words of a man's mouth are like deep waters, and the wellspring of wisdom like a flowing brook.
Psalm 64:6
They search out iniquities; they accomplish a diligent search: both the inward thought of every one of them, and the heart, are deep.
1 Corinthians 2:11
For what man knows the things of a man, except the spirit of man which is in him? even so the things of God knows no man, but the Spirit of God.