Augustine of Hippo
Catena Aurea · Johannesevangelium 3
Nicodemus answered and said unto him, How can these things be? Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things? Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things.
(Tr. xii. c. 6) What think we? that our Lord wished to insult this master in Israel? He wished him to be born of the Spirit: and no one is born of the Spirit except he is made humble; for this very humility it is, which makes us to be born of the Spirit. He however was inflated with his eminence as a master, and thought himself of importance because he was a doctor of the Jews. Our Lord then casts down his pride, in order that he may be born of the Spirit.