Then said Mary unto the angel, How shall this be, seeing I know not a man?
All Commentaries on Luke 1:34 Go To Luke 1
Augustine of Hippo
AD 430
Indeed, her virginity was itself more beautiful and more pleasing, because Christ, in his conception, did not himself take away that which he was preserving from violation by humanity; but, before he was conceived he chose one already consecrated to God of whom he would be born.