'Cannot' in the Bible

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.

You cannot drink the cup of the Lord and the cup of demons. You cannot take part in the table of the Lord and the table of demons.

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."

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.