1 Corinthians 2:12

that the natural man cannot understand it.

Overview - 1 Corinthians 2
1	He declares that his preaching, though it bring not excellency of speech, or of human wisdom, yet consists in the power of God;
6	and so far excels the wisdom of this world, and human sense,

Treasury of Scripture Knowledge

1 Corinthians 2:12  (King James Version)
Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.
 

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not

6 ; Romans 8:1 Romans 8:5 Romans 8:6 ; 2 Corinthians 4:4 ; Ephesians 2:2 ; James 4:5 ; 1 John 4:4 1 John 4:5 ; 5:19 Revelation 12:9

but

Romans 8:15 Romans 8:16

that

3:22 John 16:14 John 16:15 ; Romans 8:32 ; 1 John 2:20 1 John 2:27 ; 5:20 Revelation 22:6