Ambrose of Milan

But He, although He took on Him our flesh, although He was made man that He might redeem man, and recal him from death, still, as being God, came upon earth in an extraordinary way, that as He had said, 'Behold I make all things new,' so also He might be born of an immaculate virgin, and be believed to be, as it is written, 'God with us.' But from their perverse ways they are induced to say 'She was a virgin when she conceived, but not a virgin when she brought forth.' Could she then conceive as a virgin, and yet not be able to bring forth as a virgin, when conception always precedes, and birth follows?