Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God... unless one is born of water and the Spirit he cannot enter into the kingdom of God. That which has been born of the flesh is flesh, and that which has been born of the Spirit is spirit. Do not marvel that I said to you, 'You must be born again.' The wind blows where it wishes and you hear its sound, but do not know where it comes from and where it is going; so is everyone who has been born of the Spirit.