John Chrysostom

(Hom. xi. [x.] 1) Or thus, After saying that they were born of God, who received Him, he sets forth the cause of this honour, viz. the Word being made flesh, God’s own Son was made the son of man, that he might make the sons of men the sons of God. Now when thou hearest that the Word was made flesh, be not disturbed, for He did not change His substance into flesh, which it were indeed impious to suppose; but remaining what He was, took upon Him the form of a servant. But as there are some who say, that the whole of the incarnation was only in appearance, to refute such a blasphemy, he used the expression, was made, meaning to represent not a conversion of substance, but an assumption of real flesh. But if they say, God is omnipotent; why then could He not be changed into flesh? we reply, that a change from an unchangeable nature is a contradiction.