Ambrose of Milan
Catena Aurea · Lukasevangelium 3
And as the people were in expectation, and all men mused in their hearts of John, whether he were the Christ, or not; John answered, saying unto them all, I indeed baptize you with water; but one mightier than I cometh, the latchet of whose shoes I am not worthy to unloose: he shall baptize you with the Holy Ghost and with fire. Whose fan is in his hand, and he will throughly purge his floor, and will gather the wheat into his garner; but the chaff he will burn with fire unquenchable.
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.