Ambrose of Milan — as excerpted in the Catena Aurea on Luke 3:15-17

“Now what could be more absurd than that he who was fancied to be in another should not be believed in his own person? He whom they thought to have come by a woman, is not believed to have come by a virgin; while in fact the sign of the Divine coming was placed in the childbearing of a virgin, not of a woman.”