Come then, wind up your cavils against the most sacred and reverend works of nature; inveigh against all that you are; destroy the origin of flesh and life; call the womb a sewer of the illustrious animal—in other words, the manufactory for the production of man; dilate on the impure and shameful tortures of parturition, and then on the filthy, troublesome, contemptible issues of the puerperal labour itself! But yet, after you have pulled all these things down to infamy, that you may affirm them to be unworthy of God, birth will not be worse for Him than death, infancy than the cross, punishment than nature, condemnation than the flesh. If Christ truly suffered all this, to be born was a less thing for Him. If Christ suffered evasively, as a phantom; evasively, too, might He have been born. Such are Marcion’s chief arguments by which he makes out another Christ; and I think that we show plainly enough that they are utterly irrelevant, when we teach how much more truly consistent with God is the reality rather than the falsehood of that condition in which He manifested His Christ. Since He was “the truth,” He was flesh; since He was flesh, He was born.
Tertullian
The Five Books Against Marcion, Book III
Chapter XI