Luke 1:34 Then said Mary unto the angel, How shall this be, seeing I know not a man?

John 6:52 The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?

John 6:60 Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?

John 3:4 Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born?

1 Corinthians 2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.