John 3:9

Nicodemus said to him, "How can this be?"

Then the Jews began to argue among themselves, saying, "How can this man give us his flesh to eat?"

Many of his disciples, when they heard it, said, "This is a hard saying; who can listen to it?"

And Mary said to the angel, "How can this be, since I am a virgin?"

And he looked up and said, "I see men; but they look like trees, walking."

Nicodemus said 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?"

Treasury of Scripture Knowledge

Nicodemus answered and said unto him, How can these things be?

For everyone who asks receives, and he who seeks finds, and to him who knocks it will be opened.

They said to him, "Then how were your eyes opened?"