1 Corinthians 2:14-18

But a natural person does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually discerned.

But the one who is spiritual discerns all things, yet he himself is discerned by no one.

For who has known the mind of the Lord, that he will instruct Him? But we have the mind of Christ.