Tertullian Against Marcion Book III And how else could they have said that His mother and His brethren were standing without?[147] Tertullian On the Flesh of Christ But whenever a dispute arises about the nativity, all who reject it as creating a presumption in favour of the reality of Christ's flesh, wilfully deny that God Himself was born, on the ground that He asked, "Who is my mother, and who are my brethren? "[100]