Nicodemus said 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?
All Commentaries on John 3:4 Go To John 3
Augustine of Hippo
AD 430
It is the Spirit that speaks, whereas he understands carnally; he knew of no birth save one, that from Adam and Eve; from God and the Church he knows of none. But do you so understand the birth of the Spirit, as Nicodemus did the birth of the flesh; for as the entrance into the womb cannot be repeated, so neither can baptism.
As if He said, You understand me to speak of a carnal birth; but a man must be born of water and of the Spirit, if he is to enter into the kingdom of God. If to obtain the temporal inheritance of his human father, a man must be born of the womb of his mother; to obtain the eternal inheritance of his heavenly Father, he must be born of the womb of the Church. And since man consists of two parts, body and soul, the mode even of this latter birth is twofold; water the visible part cleansing the body; the Spirit by His invisible cooperation, changing the invisible soul.
Because He does not say, Except a man be born again of water and of the Spirit, he shall not have salvation, or eternal life; but, he shall not enter into the kingdom of God; from this, some infer that children are to be baptized in order to be with Christ in the kingdom of God, where they would not be, were they not baptized; but that they will obtain salvation and eternal life even if they die without baptism, not being bound with any chain of sin. But why is a man born again, except to be changed from his old into a new state? Or why does the image of God not enter into the kingdom of God, if it be not by reason of sin?
But who of us does not see, for example, that the south wind blows from south to north, another wind from the east, another from the west? And how then do we not know whence the wind comes, and whither it goes?
The Psalm sounds, the Gospel sounds, the Divine Word sounds; it is the sound of the Spirit. This means that the Holy Spirit is invisibly present in the Word and Sacrament, to accomplish our birth.
Or thus: If you are born of the Spirit, you will be such, that he, who is not yet born of the Spirit, will not know whence you come, or whither you go. For it follows, So is every one that is born of the Spirit.
