So Eusebius was not disinterested with respect to the publication of Contra Celsum. He actively cited it in political discourse in the age. This is significant. This is a powerful statement driving home our main point - "to this work of Origen (i.e. Against Celsus) I must refer those who in good faith and with genuine "love of truth " desire accurately to understand my own position." Morlet notes he presents the "at the beginning of the Against Hierocles Eusebius directs the reader to Against Celsus "as the prototype of every possible refutation." But it goes far beyond this. Morlet has done a systematic study of another Eusebian text - Prophetical Extracts - and noted that it too shares uncanny similarities in language with Against Celsus.So then, my dear friend, you find worthy of no little admiration the parallel which, embellished with many marvels, this author has drawn between the man of Tyana and our own Saviour and teacher. For already against the rest of the contents of the "Lover of Truth " (Φιλαλήθει), for so he has thought fit to entitle his work against us, it would be useless to take my stand at present; because they are not his own, but have been pilfered in the most shameless manner, not only I may say in respect of their ideas, but even of their words and syllables, from other authorities. Not but what these parts also of his treatise call for their refutation in due season; but to all intents and purposes they have, even in advance of any special work that might be written in answer to them, been upset and exposed beforehand in a work which in as many as eight books Origen composed against the book which Celsus wrote and--even more boastfully than the " Lover of Truth (Φιλαλήθους)"--entitled " True Reason (Ἀληθῆ λόγον)." The work of Celsus is there subjected to an examination in an exhaustive manner and on the scale above mentioned by the author in question, who in his comprehensive survey of all that anyone has said or will ever say on the same topic., has forestalled any solution of your difficulties which I could offer. To this work of Origen I must refer those who in good faith and with genuine "love of truth " desire accurately to understand my own position. I will therefore ask you for the present to confine your attention to the comparison of Jesus Christ with Apollonius which is found in this treatise called the " Lover of Truth," without insisting on the necessity of our meeting the rest of his arguments, for these are pilfered from other people. We may reasonably confine our attention for the present to the history of Apollonius, because Hierocles, of all the writers who have ever attacked us, stands alone in selecting Apollonius, as he has recently done, for the purposes of comparison and contrast with our Saviour.
Of course his conclusions differ quite remarkably from mine. He writes "Eusebius’ text is inspired by several passages from Against Celsus, and probably by other parallels in Origen’s works. Such parallels may also indicate that he also depends on a lost work by Origen, maybe the prologue of the lost commentary on Isaiah." https://www.academia.edu/6136229/_Orige ... p._207-237 I think Morlet's conclusions are the safe choice but ultimately the wrong choice. Instead we should look to the intimations in Jerome of an Eusebian 'correction' of Origen. Traditionally - thanks to Jerome's discussion of the subject against Rufinus - the understanding has been that Eusebius simply attempted to purge Origen of heretical statements. However I think the weight of evidence suggests something else.
Eusebius rewrote whatever lies under Against Celsus AS IF it were Origen responding to the treatise seventy years later. The composition of the rewrite (i.e. Eusebius's editorial efforts) likely coincided with Against Hierocles. In other words, in the process of attempting to discredit the Roman prefect of Egypt's effort to ridicule Jesus, Contra Celsum was invented and its strange emphasis that Origen resisted writing the treatise until a very late date being forced to do it by his patron Ambrose. In other words, it is highly likely that the text wasn't known to anyone.
The reason I hated mountainman's presence at the forum is that discussions like this couldn't be fleshed out without his vulgar approach to the problem (Eusebius invented Christianity) dominating the conversation. The evidence for Eusebian forgery is now very strong (Testimonium Flavianum etc) is very strong . But we can't get carried away with it.