Tertullian

“ This is the new nativity; a man is born in God. And in this man God was born, taking the flesh of an ancient race, without the help, however, of the ancient seed, in order that He might reform it with a new seed, that is, in a spiritual manner, and cleanse it by the re-moval of all its ancient stains. But the whole of this new birth was prefigured, as was the case in all other instances, in ancient type, the Lord being born as man by a dispensation in which a virgin was the medium. ”

“ The earth was still in a virgin state, reduced as yet by no human labour, with no seed as yet cast into its furrows, when, as we are told, God made man out of it into a living soul. [4] As, then, the first Adam is thus introduced to us, it is a just inference that the second Adam likewise, as the apostle has told us, was formed by God into a quickening spirit out of the ground,—in other words, out of a flesh which was unstained as yet by any human generation. ”

“ God therefore sent down into the virgin’s womb His Word, as the good Brother, who should blot out the memory of the evil brother. Hence it was necessary that Christ should come forth for the salvation of man, in that condition of flesh into which man had entered ever since his condemnation. ”