Augustine of Hippo

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(de Hæres. 55.) The Apollinarians also as the Arians affirmed that Christ had taken the human flesh without the soul. But overthrown on this point by the weight of Scripture proof, they then said that that part which is the rational soul of man was wanting to the soul of Christ, and that its place was filled by the Word itself. But if it be so, then we must believe that the Word of God took on Him the nature of some brute with a human shape and appearance. But even concerning the nature of Christ’s body, there are some who have so far swerved from the right faith, as to say, that the flesh and the Word were of one and the same substance, most perversely insisting on that expression, The Word was made flesh; which they interpret that some portion of the Word was changed into flesh, not that He took to Him flesh of the flesh of the Virgind.