1 Corinthians 2:11

that the natural man cannot understand it.
Overview - 1 Corinthians 2
He declares that his preaching, though it bring not excellency of speech, or of human wisdom, yet consists in the power of God;
and so far excels the wisdom of this world, and human sense,
Treasury of Scripture Knowledge

1 Corinthians 2:11  (King James Version)
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.

Proverbs 14:10 ; Proverbs 20:5 Proverbs 20:27 Jeremiah 17:9

10 ; Romans 11:33 Romans 11:34