The Source of New Birth

"He 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."
(John 3:2)

Nicodemus and the New Birth

Nicodemus is a Pharisee, a member of the Jewish ruling council.
He believes Jesus is a Rabbi (teacher) from God.
He knows Jesus has done miracles by the power of God.
He came to Jesus during the night.
He was one of the men who buried the dead body of Jesus. (John 19)

The Conversation

Nicodemus
You are a Rabbi! You do miracles! You are from God!

Jesus
"No one can see the Kingdom of God unless he is born again."

Nicodemus
"How can a man be born when he is old?

Jesus
"I tell you the truth, no one can enter the Kingdom of God unless he is born
of water and Spirit."

Nicodemus
"How can this be?"

The meaning of the riddle?