But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned. But he who is spiritual judges all things, yet he himself is rightly judged by no one. For “who has known the mind of the Lord that he may instruct Him?” But we have the mind of Christ. (1 Corinthians 2:14-16)
The “natural man” is the person who refuses to be guided by divine revelation. He “does not receive the things of the Spirit of God” that were revealed to Christ’s apostles and spoken by inspiration (1 Cor. 2:10-13). He lives his life on the basis of human reasoning alone. In his carnal way of thinking he does not have the spiritual discernment to receive them. To him, “the message of the cross is foolishness” (1 Cor. 1:18). He is carnal, and he is perishing in his sins (1 Cor. 1:18). On the other hand, the “spiritual” person examines all things in the light of God’s word and refuses to try to tell God what His will should be. We have the “mind of Christ” in the apostolic word (the gospel). Those who are spiritual trust it and conform themselves to it. Be spiritual, not carnal.