To Florus 4.47

Here, then, I urge the reader to attend with his whole mind. He will see the Apollinarist heresy revived through you, but with a Manichaean addition. For Apollinaris is said at first to have introduced this account of Christ’s incarnation: only a body seemed to have been assumed from human substance, while the divinity itself took the place of a soul. Christ would thus appear to have taken up a human corpse, not a human being. This began to be overturned by the testimony both of reason and of the Gospel. For if he had assumed flesh alone, everything Christ said in calling himself a man whom the Jews persecuted for speaking the truth would necessarily be accused of falsehood, since a human being cannot exist without soul and body together (compare John 8:40). Or again, he had said in the Gospel: “I have power to lay down my soul, and I have power to take it up again” (John 10:18). What soul could be laid down if none had been assumed? After being refuted by the authority of such testimonies and by evident reason, Apollinaris devised another claim from which his heresy, still continuing today, arose. He said that Christ did possess a human soul, but lacked bodily sensations; and he pronounced him incapable of being affected by any sins.