The heart knows its own bitterness, and a stranger does not share in its joy.

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

The spirit of man is the lamp of Jehovah, searching all the inward parts of the belly.

The heart is deceitful above all things, and desperately wicked; who can know it?

But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God.

Oh, the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments and His ways past finding out!

For who has known the mind of the Lord? Or who has become His counselor?