John 3:4
Nicodemus saith to him, How can a man be born, when he is old? Can he enter a second time into his mother's womb, and be born?
John 3:3
Jesus answered and said to him, Verily, verily I say unto thee, Except a man be born again, he cannot see the kingdom of God.
John 4:11-12
The woman saith to him, Sir, thou hast nothing to draw with, and the well is deep: whence then hast thou that living water?
John 6:53
But Jesus said to them, Verily, verily I say unto you, unless ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
John 6:60
Many of his disciples hearing it, said, This is an hard saying: who can hear it?
1 Corinthians 1:18
For the doctrine of the cross is indeed to them that perish foolishness; but to us who are saved, it is the power of God.
1 Corinthians 2:14
But the natural man receiveth not the things of the Spirit; for they are foolishness to him: neither can he know them, because they are spiritually discerned.