1 Corinthians 2:14

2:14 The unbeliever does not receive the things of the Spirit of God, for they are foolishness to him. And he cannot understand them, because they are spiritually discerned.

1 Corinthians 12:21

12:21 The eye cannot say to the hand, “I do not need you,” nor in turn can the head say to the foot, “I do not need you.”

1 Corinthians 15:50

15:50 Now this is what I am saying, brothers and sisters: Flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.