1 Corinthians 2:2

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 2:2  (King James Version)
For I determined not to know any thing among you, save Jesus Christ, and him crucified.

1:22-25 John 17:3 ; Galatians 3:1 ; 6:14 Philippians 3:8-10