John 2:23-3:10

23Now while he was in Jerusalem at the Passover Feast, many people saw the miraculous signs he was doing and believed in his name. 24But Jesus would not entrust himself to them, for he knew all men. 25He did not need man's testimony about man, for he knew what was in a man.
John 3
Jesus Teaches Nicodemus
1Now there was a man of the Pharisees named Nicodemus, a member of the Jewish ruling council. 2He came to Jesus at night and said, "Rabbi, we know you are a teacher who has come from God. For no one could perform the miraculous signs you are doing if God were not with him."

3In reply Jesus declared, "I tell you the truth, no one can see the kingdom of God unless he is born again."

4"How can a man be born when he is old?" Nicodemus asked. "Surely he cannot enter a second time into his mother's womb to be born!"

5Jesus answered, "I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit. 6Flesh gives birth to flesh, but the Spirit gives birth to spirit. 7You should not be surprised at my saying, 'You must be born again.' 8The wind blows wherever it pleases. You hear its sound, but you cannot tell where it comes from or where it is going. So it is with everyone born of the Spirit."

9"How can this be?" Nicodemus asked.

10"You are Israel's teacher," said Jesus, "and do you not understand these things?