Jesus answered him, "Most assuredly, I tell you, unless one is born anew,{The word translated "anew" here and in John 3:7 (anothen) also means "again" and "from above".} he can't see the Kingdom of God."
By the phraseborn again is expressed not the correction of one part, but the renovation of the whole nature. Hence it follows, that there is nothing in us that is not sinful; for if reformation is necessary in the whole and in each part, corruption must have been spread throughout. On this point we shall soon have occasion to speak more largely. Erasmus, adopting the opinion of Cyril, has improperly translated the adverb ἄνωθεν, from above, and renders the clause thus: unless a man be born from above. The Greek word, I own, is ambiguous; but we know that Christ conversed with Nicodemus in the Hebrew language. There would then have been no room for the ambiguity which occasioned the mistake of Nicodemus and led him into childish scruples about a second birth of the flesh. He therefore understood Christ to have said nothing else than that a man must be born again, before he is admitted into the kingdom of God. 