John 3:1-15.
Now there was a man among the Pharisees, named Nicodemus, a ruler among the Jews; who came to JEsu by night, and said unto him, Master, we know that thou art a teacher come from God: for no man can do the signs which thou doest, except God be with him. Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God. Nicodemus saith unto him, How can a man be born when he is old? can he also go again into his mother's womb, and be born? Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. Do not be surprised that I said to you: You must be born again. The wind bloweth where it listeth, and thou hearest the sound thereof; but knowest not whence it cometh, nor whither it goeth. So is every one that is born of the Spirit. Nicodemus answered and said unto him, How can these things be? Jesus answered and said unto him, Art thou a master in Israel, and knowest not these things? Verily, verily, I say unto thee, we speak that we know, and testify that we have seen; and ye receive not our testimony. Do you not believe when I tell you of earthly things; how would you believe if I told you of heavenly things? And no man goeth up to heaven, but he that descended from heaven, even the Son of man, which is in heaven. And as Moses lifted up a serpent in the wilderness, so must the Son of man be lifted up, that whosoever believeth in him should not perish, but have everlasting life? *)