That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
All Commentaries on John 3:6 Go To John 3
Hippolytus of Rome
AD 235
But what (is born) below is carnal, that is, he says, what is written. "That which is born of the flesh is flesh, and that which is born of the spirit is spirit.".
In sooth, have been put in trust to give the account of His generation after the flesh; and are you then so bold as to seek the account (of His generation) after the Spirit, which the Father keeps with Himself, intending to reveal it then to the holy ones and those worthy of seeing His face? Rest satisfied with the word spoken by Christ, viz., "That which is born of the Spirit is spirit"