Ye must be born again

(John 3:1-21 [KJV])
 [1] There was a man of the Pharisees, named Nicodemus, a ruler of the Jews:
 [2] The same came to Jesus by night, and said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these miracles that thou doest, except God be with him.
 [3] 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.
 [4] Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born?
 [5] 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.
 [6] That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
 [7] Marvel not that I said unto thee, Ye must be born again.
 [8] The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.
 [9] Nicodemus answered and said unto him, How can these things be?
 [10] Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things?
 [11] Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.
 [12] If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?
 [13] And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
 [14] And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up:
 [15] That whosoever believeth in him should not perish, but have eternal life.
 [16] For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
 [17] For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
 [18] He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
 [19] And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
 [20] For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.
 [21] But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.