John 3:4
Nicodemus said to him, "How can a man be born [when he] is an old man? He is not able to enter into his mother's womb for the second time and be born, [can he]?"
John 3:3
Jesus answered and said to him, "Truly, truly I say to you, unless someone is born from above, he is not able to see the kingdom of God."
John 4:11-12
The woman said to him, "Sir, you have no bucket and the well is deep! From where then do you get this living water?
John 6:53
Then Jesus said to them, "Truly, truly I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life in yourselves!
John 6:60
Thus many of his disciples, [when they] heard [it], said, "This saying is hard! Who can understand it?"
1 Corinthians 1:18
For the message about the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
1 Corinthians 2:14
But the natural man does not accept the things of the Spirit of God, for they are foolishness to him, and he is not able to understand [them], because they are spiritually discerned.