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, is deep.

Proverbs 18:4

The words of a man's mouth are as deep waters, and the well-spring of wisdom as a flowing brook.

1 Corinthians 2:11

For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth 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 as deep waters, and the well-spring of wisdom as 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, is deep.
1 Corinthians 2:11
For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.