The manner of his birth proves the truth about the Lord: a virgin conceived without knowing a man; her belly was filled, having been touched by no embrace; and her chaste womb received the Holy Spirit, whom her pure members preserved and her unsullied body carried. Behold the miracle of the mother of the Lord! She is a virgin when she conceives, a virgin when she brings forth, a virgin after birth. What glorious virginity! What splendid fruitfulness! The world’s goodness is born, and there is no pain of childbirth. The womb is emptied, a child is brought forth, and still virginity is not violated. For it was fitting that when God was born, the value of chastity should increase, and that one who was untouched should not be violated by his coming—he who came to heal what was injured—and that bodily purity should not be harmed by him who bestows virginity on those who have been baptized and had formerly been unchaste. The child who has been born, then, is placed in a crib. This is God’s first dwelling place, and the ruler of heaven does not disdain these straitened circumstances—he whose home was the virginal womb. Clearly Mary was a fit habitation for Christ not because of the nature of her body but because of the grace of her virginity.
-- Maximus of Turin, Sermons