1 Corinthians 2:11 - 2:14
11 For who among men knows the depths of a man except the spirit of the man which is in him? Even so the depths of God no one knows except the Spirit of God. 12 Now we have received, not the spirit of the world, but the Spirit who is from God, so that we may know the depths graciously given to us by God, 13 of which depths we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual depths with spiritual words. 14 But a natural man does not accept the depths of the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually examined.