The Spirit extols this virginity, however, because it was needful for the conceiving and bearing of this blessed fruit. Because of the corruption of our flesh, such blessed fruit could not come, except through a virgin. Thus this tender virginity existed in the service of others to the glory of God, not to its own glory. If it had been possible for him to have come from a [married] woman, he would not have selected a virgin for this, since virginity is contrary to the physical nature within us, was condemned of old in the law, and is extolled here solely because the flesh is tainted and its built-in physical nature cannot bestow her fruit except by means of an accursed act.
Hence we see that St. Paul nowhere calls the mother of God a virgin, but only a woman, as he says in Galatians 3 [4:4], "The Son of God was born of a woman." He did not mean to say she was not a virgin, but to extol her virginity to the highest with the praise that is proper to it, as much as to say: In this birth none but a woman was involved, no man participated; that is, everything connected with it was reserved to the woman, the conceiving, bearing, suckling, and nourishing of the child were functions no man can perform. It is therefore the child of a woman only; hence, she must certainly be a virgin. But a virgin may also be a man; a mother can be none other than a woman.
For this reason, too, Scripture does not quibble or speak about the virginity of Mary after the birth of Christ, a matter about which the hypocrites are greatly concerned, as if it were something of the utmost importance on which our whole salvation depended. Actually, we should be satisfied simply to hold that she remained a virgin after the birth of Christ because Scripture does not state or indicate that she later lost her virginity. We certainly need not be so terribly afraid that someone will demonstrate, out of his own head apart from Scripture, that she did not remain a virgin. But the Scripture stops with this, that she was a virgin before and at the birth of Christ; for up to this point God had need of her virginity in order to give us the promised blessed seed without sin.
