"Paul did not say `conformed to the Son of God' but `conformed to the image of His Son' in order to point out a distinction between the Son and His image, for the Son, wearing the divine tokens of His Father's Excellence, is an image of His Father; for since like are generated of like, offspring appear as very images of their parents, but the manhood which He wore is an image of the Son, as images even of different colours are painted on wax, some being wrought by hand and some by nature and likeness. Moreover the very law of truth announces this, for the bodiless spirit of wisdom is not conformed to bodily men, but the express image made man by the spirit bearing the same number of members with all the rest, and clad in similar form."
Of the same from the same work:-
"That he speaks of the body as conformed to those of men he teaches more clearly in his Epistle to the Philippians, `our conversation' he says `is in Heaven from whence also we look for the Saviour, the Lord Jesus Christ, who shall change our vile body that it may be fashioned like unto His glorious body.' And if by changing the form of the vile body of men He fashions it like unto His own body, then the false teaching of our opponents is shewn to be in every way worthless."
Of the same from the same work:-
"But as being born of the Virgin He is said to have been made man of the woman, so He is described as being made under the law because of His sometimes walking by the precepts of the law, as for instance when His parents zealously urged His circumcision, when He was a child eight days old, as relates the evangelist Luke, afterwards `they brought Him to present Him to the Lord,' `bringing the offerings of purification' `to offer a sacrifice according to that which is said in the law of the Lord a pair of turtle doves or two young pigeons.' As then the gifts of purification were offered on His behalf according to the law, and He underwent circumcision on the eighth day, the Apostle very properly writes that He was thus brought under the law. Not indeed that the Word was subject to the law, (as our calumnious opponents suppose) being Himself the law, nor did God, who by one breath can cleanse and hallow all things, need sacrifices of purification. But He took from the Virgin the members of a man and became subject to the law and was purified according to the rite of the firstborn, not because He submitted to this treatment from any need on His part of such observance, but in order that He might redeem from the slavery of the law them that were sold to the doom of the curse."
Testimony of the holy Athanasius, bishop of Alexandria.
From his Second Discourse against heresies: -
"We should not have been redeemed from sin and the curse had not the flesh which the Word wore been by nature that of man, for we should have had nothing in common with that which was not our own; just so man would not have been made God, had not the Word which was made flesh been by nature of the Father and verily and properly His. And the combination is of this character that to the natural God may be joined the natural man, and so his salvation and deification be secure. Therefore let them that deny Him to be naturally of the Father, and own Son of His substance, deny too that He took very flesh of man from the Virgin Mary."
Of the same from his Epistle to Epictetus:-
"If on account of the Saviour's Body being, and being described in the Scriptures as being, derived from Mary, and a human Body, they fancy that a quaternity is substituted for a Trinity, as though some addition were made by the body, they are quite wrong; they put the creature on a par with the Creator, and suppose that the Godhead is capable of being added to. They fail to see that the Word was not made flesh on account of any addition to Godhead, but that the flesh may rise. Not for the aggrandisement of the Word did He come forth from Mary, but that the human race may be redeemed. How can they think that the body ransomed and quickened by the Word can add anything in the way of Godhead to the Word that quickened it?"
Of the same from the same Epistle:-
"Let them be told that if the Word had been a creature, the creature would not have assumed a body to quicken it. For what help can creatures get from a creature standing itself in need of salvation? But the Word, Himself Creator, was made maker of created things, and therefore in the fulness of the ages He attached the creature to Himself, that once more as a Creator He might renew it, and might be able to create it afresh."
From the longer Discourse "De Fide":-
"This also we add concerning the words `Sit thou on my right hand,' that they are said of the Lord's body. For if `the Lord saith, do not I fill heaven and earth,' as says Jeremiah, and God contains all things, and is contained of none, on what kind of throne does He sit? It is therefore the body to which He says `Sit thou on my right hand,' of which too the devil with his wicked powers was foe, and Jews and Gentiles too. Through this body too He was made and was called High Priest and Apostle through the mystery whereof He gave to us, saying `This is my Body for you' and `my Blood of the New Testament' (not of the Old), shed for you." Now Godhead hath neither body nor blood; but the manhood which He bore of Mary was the cause of them, of whom the Apostles said `Jesus of Nazareth, a man approved of God among you.'"
Of the same from his book against the Arians:-
"And when he says `Wherefore God hath also highly exalted Him and given Him a name which is above every name' he speaks of the temple of the body, not of the Godhead, for the Most High is not exalted, but the flesh of the Most High is exalted, and to the flesh of the Most High He gave a name which is above every name. Nor did the Word of God receive the designation of God as a favour, but His flesh was held divine as well as Himself."
Of the same from the same work:-
"And when he says `the Holy Ghost was not yet because that Jesus was not yet glorified,' he says that His flesh was not yet glorified, for the Lord of glory is not glorified, but the flesh itself receives glory of the glory of the Lord as it mounts with Him into Heaven; whence he says the spirit of adoption was not yet among men, because the first fruits taken from men had not yet ascended into heaven. Wherever then the Scripture says that the Son received and was glorified, it speaks because of His manhood, not His Godhead."
Of the same from the same work:-
"So that He is very God both before His being made man and after His being made mediator of God and men, Jesus Christ united to the Father in spirit, and to us in flesh, who mediated between God and men, and who is not only man but also God."
Testimony of the Holy Ambrosius, bishop of Milan.
In his Exposition of the Faith:-
"We confess that our Lord Jesus Christ, the Only Begotten Son of God, was begotten before all ages, without beginning, of the Father, and that in these last days the same was made flesh of the holy Virgin Mary, assumed the manhood, in its perfection, of a reasonable soul and body, of one substance with the Father as touching His Godhead and of one substance with us as touching His manhood. For union of two perfect natures hath been after an ineffable manner. Wherefore we acknowledge one Christ, one Son, our Lord Jesus Christ; knowing that being coeternal with His own Father as touching His Godhead, by virtue of which also He is creator of all, He deigned, after the assent of the Holy Virgin, when she said to the angel `Behold the handmaid of the Lord, be it unto me according to thy word' to build after an ineffable fashion a temple out of her for Himself, and to unite this temple to Himself by her conception, not taking and uniting with Himself a body coeternal with His own substance, and brought from heaven, but of the matter of our substance, that is of the Virgin. God the Word was not turned into flesh; His appearance was not unreal; keeping ever His own substance immutably and invariably He took the first fruits of our nature, and united them to Himself. God the Word did not take His beginning from the Virgin, but being coeternal with His own Father He of infinite kindness deigned to unite to Himself the first fruits of our nature, undergoing no mixture but in either substance appearing one and the same, as it is written `Destroy this temple and in three days I will raise it up.' For the divine Christ, as touching my substance which he took is destroyed, and the same Christ raises the destroyed temple as touching the divine substance in which also He is Creator of all things. Never at any time after the Union which He deigned to make with Himself from the moment of the conception did He depart from His own temple, nor indeed through His ineffable love for mankind could depart.
"The same Christ is both passible and impassible; as touching His manhood passible and as touching His Godhead impassible. `Behold behold me, it is I, I have undergone no change'-and when God the Word had raised His own temple and in it had wrought out the resurrection and renewal of our nature, He shewed this nature to His disciples and said `Handle me and see for a spirit hath not flesh and bones as ye see me,' not `be' but `have.' So He says, referring to both the possessor and the possessed in order that you may perceive that what had taken place was not mixture, not change, not variation, but union. On this account too He shewed the prints of the nails and the wound of the spear and ate before His disciples to convince them by every means that the resurrection of our nature had been renewed in Him; and further because in accordance with the blessed substance of His Godhead unchanged, impassible, immortal, He lived in need of nought, He by concession permitted all that can be felt to be brought to His own temple, and by His own power raised it up, and by means of His own temple made perfect the renewal of our nature.
"Them therefore that assert that the Christ was mere man, that God the Word was passible, or changed into flesh, or that the body which He had was consubstantial, or that He brought it from Heaven, or that it was an unreality; or assert that God the Word being mortal needed to receive His resurrection from the Father, or that the body which He assumed was without a soul, or manhood without a mind, or that the two natures of the Christ became one nature by confusion and commixture; them that deny that our Lord Jesus Christ was two natures unconfounded, but one person, as He is one Christ and one Son, all these the catholic and apostolic Church condemns."