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The following quote (abridged) is from Eusebius’ "Letter to Constantia" (the sister of Constantine the Great). It shows the utter disdain of Eusebius (the first historian of the Christian church) for the trend toward idolatry that was beginning to occur in "orthodox" churches. He expressed complete outrage that any one would lapse into such depravity. All words in brackets are mine and the italics and bold letters are my emphases.
"You also wrote me about some supposed image of Christ, which image you wished me to send to you. Now what kind of thing is that you refer to as the image of Christ? I do not know what compelled you to request that an image of Our Savior should be shown.
What kind of image of Christ are you seeking? Is it the true and unadulterated one which bears His essential characteristics [His divine image], or the one which He assumed for our sake when He took up the form of a servant [His human form]? ... Granted, He has two forms, and even I do not think that your petition has to do with His divine form.
... Surely then, you are seeking His image as a servant, that of the flesh which He assumed for our sake. ... How can one paint an image so unattainable and wonderful ... unless, as so the unbelieving pagans, one is to represent things that have no possible resemblance to anything ... ? For they [the pagans] make such idols when they wish to form the likeness of what they think to be a god or, as they might say, one of the heroes or anything else of like nature, yet they are unable even to approach a likeness, and accurately represent some strange human forms. Surely, even you will agree with me that such practices are illegal for us. [Eusebius believed, accurately so, that even a true likeness of Jesus ― if one were available ― was still not allowed to be displayed by biblical teaching.] Have you ever heard of such a resemblance yourself in church or from another person? Are not such things excluded and banished from churches all over the world, and does not everyone know that such practices are not permitted to us alone?
"Once there was a woman, I do not know how, brought me in her hands a picture of two men in the demeanor of philosophers [with their hair long ― see Dio Chrysostom, “Oration Thirty-Five,” vol.III, pp.393, 401] and the woman mentioned that they were Paul and the Savior.
I have no way of knowing where she got this information or where she learned it. But in order that neither she nor others might receive offense, I took the picture away from her and kept it in my house, as I thought it was improper for such things to be displayed to others, lest we appear, like idol worshipers, to carry our God around in an image. I note that Paul informs all of us not to hold any more to things of the flesh; because he tells us that though we have known Christ after the flesh, yet from now on we know Him no more."