Nicodemus Must Be Born Again

John 3:1 thru 3:12
Now there was a man of the Pharisees named Nicodemus, a ruler of the Jews. The same came to him by night, and said to him, "Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do, unless God is with him." Jesus answered him, "Most certainly, I tell you, unless one is born anew, he can't see the Kingdom of God." 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?" Jesus answered, "Most certainly I tell you, unless one is born of water and spirit, he can't enter into the Kingdom of God!

That which is born of the flesh is flesh. That which is born of the Spirit is spirit. Don't marvel that I said to you, 'You must be born anew.' The wind blows where it wants to, and you hear its sound, but don't know where it comes from and where it is going. So is everyone who is born of the Spirit." Nicodemus answered him, "How can these things be?" Jesus answered him, "Are you the teacher of Israel, and don't understand these things?

Most certainly I tell you, we speak that which we know, and testify of that which we have seen, and you don't receive our witness. If I told you earthly things and you don't believe, how will you believe if I tell you heavenly things?