1 Corinthians 2:12-14

But we received not the spirit of the world, but the Spirit which is from God, that we might know the things that were freely given to us by God. We also speak these things, not in words which man’s wisdom teaches but which the Holy Spirit teaches, comparing spiritual things with spiritual things. Now the natural man doesn’t receive the things of God’s Spirit, for they are foolishness to him; and he can’t know them, because they are spiritually discerned.