All that is known about Celsus himself comes from the surviving text of his book and from what Origen says about him. Although Origen initially refers to Celsus as an Epicurean, his arguments reflect ideas of the Platonic tradition, rather than Epicureanism. Origen attributes this to Celsus's inconsistency, but modern historians see it instead as evidence that Celsus was not an Epicurean at all. Joseph Wilson Trigg states that Origen probably confused Celsus, the author of The True Word, with a different Celsus, who was an Epicurean philosopher and a friend of the Syrian satirist Lucian. Celsus the Epicurean must have lived around the same time as the author of The True Word and he is mentioned by Lucian in his treatise On Magic. Both Celsus the friend of Lucian and Celsus the author of The True Word evidently shared a passionate zeal against superstitio, making it easy to see how Origen could have concluded that they were the same person.
Thomas remarks that Celsus "is no genius as a philosopher". Nonetheless, most scholars, including Thomas, agree that Origen's quotations from The True Word reveal that the work was well-researched. Celsus demonstrates extensive knowledge of both the Old and New Testaments and of both Jewish and Christian history. Celsus was also closely familiar with the literary features of ancient polemics. Celsus seems to have read at least one work by one of the second-century Christian apologists, possibly Justin Martyr or Aristides of Athens. From this reading, Celsus seems to have known which kinds of arguments Christians would be most vulnerable to. He also mentions the Ophites and Simonians, two Gnostic sects that had almost completely vanished by Origen's time. One of Celsus's main sources for Books I–II of The True Word was an earlier anti-Christian polemic written by an unknown Jewish author, whom Origen refers to as the "Jew of Celsus". This Jewish source also provides well-researched criticism of Christianity and, although Celsus was also hostile to Judaism, he occasionally relies on this Jewish author's arguments, to demonstrate the inconsistency of the Christian position, and he also uses Christian arguments among others to deconstruct the Jewish religion.
Celsus initiated a critical attack on Christianity, ridiculing many of its dogmas. He wrote that some Jews said Jesus's father was actually a Roman soldier named Pantera. Origen considered this a fabricated story. In addition, Celsus addressed the miracles of Jesus, holding that "Jesus performed his miracles by sorcery (γοητεία)":
Origen wrote his refutation in 248, and it includes quotes, paraphrases, and references to Celsus's arguments. Since accuracy was essential to his refutation of The True Doctrine, most scholars agree that Origen is a reliable source for what Celsus wrote.
Biblical scholar Arthur J. Droge has written that it is incorrect to refer to Celsus's perspective as polytheism. Instead, he was a henotheist, as opposed to the Jewish strict monotheism; historian Wouter Hanegraaff explains that "the former has room for a hierarchy of lower deities which do not detract from the ultimate unity of the One." Celsus shows himself familiar with the story of Jewish origins. Conceding that Christians are not without success in business (infructuosi in negotiis), Celsus wants them to be good citizens, to retain their own belief but worship the emperors and join their fellow citizens in defending the empire. This appeal on behalf of unity and mutual toleration nevertheless centers on submission to the state and military service. One of Celsus's bitterest complaints is that Christians refused to cooperate with civil society and held local customs and the ancient religions in contempt. The Christians viewed these as idolatrous and inspired by evil spirits, whereas polytheists like Celsus thought of them as the works of the Daemons, or the god's ministers, who ruled mankind in his place to keep him from the pollution of mortality. Celsus attacks the Christians as feeding off faction and disunity, and accuses them of converting the vulgar and ignorant, while refusing to debate wise men. As for their opinions regarding their sacred mission and exclusive holiness, Celsus responds by deriding their insignificance, comparing them to a swarm of bats, or ants creeping out of their nest, or frogs holding a symposium round a swamp, or worms in conventicle in a corner of the mud. It is not known how many were Christians at the time of Celsus (the Jewish population of the empire may have been about 6.6–10% in a population of 60 million to quote one reference).
Young, Frances M. (2006). "Monotheism and Christology". In Mitchell, Margaret M.; Young, Frances M. (eds.). The Cambridge History of Christianity: Origins to Constantine. Vol. 1. Cambridge: Cambridge University Press. pp. 452–470. ISBN 978-0-521-81239-9. 978-0-521-81239-9
Chisholm 1911, p. 609. - Chisholm, Hugh, ed. (1911). "Celsus" . Encyclopædia Britannica. Vol. 5 (11th ed.). Cambridge University Press. pp. 609–611. https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Celsus
Gottheil, Richard; Krauss, Samuel (1906). "CELSUS (Kέλσος)". Jewish Encyclopedia. Kopelman Foundation. Retrieved 4 September 2020. /wiki/Richard_James_Horatio_Gottheil
Hoffmann p.29
Ulrich R. Rohmer (15 January 2014). Ecce Homo: A collection of different views on Jesus. BookRix GmbH & Company KG. p. 98. ISBN 978-3-7309-7603-6. 978-3-7309-7603-6
Gottheil, Richard; Krauss, Samuel (1906). "CELSUS (Kέλσος)". Jewish Encyclopedia. Kopelman Foundation. Retrieved 4 September 2020. /wiki/Richard_James_Horatio_Gottheil
Gottheil, Richard; Krauss, Samuel (1906). "CELSUS (Kέλσος)". Jewish Encyclopedia. Kopelman Foundation. Retrieved 4 September 2020. /wiki/Richard_James_Horatio_Gottheil
Hanegraaff p.22
Hanegraaff p.22
Hoffmann 1987, pp. 30–32 - Hoffmann, R. Joseph (1987). On the True Doctrine: A Discourse Against the Christians. Oxford University Press. ISBN 978-0-19-504151-4. https://archive.org/details/ontruedoctrine00cels
Chadwick, H., Origen: Contra Celsum, CUP (1965), p. xxviii. The arguments for the date depend on factors such as the state of the art of gnosticism, possible references to the Augusti, appeals to defense against barbarian invasion, and the possibility of identifying the persecution described by Celsus with a historical one.
Wilken 2003, p. 94. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Trigg 1983, p. 215. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Wilken 2003, pp. 94–95. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Trigg 1983, pp. 215–216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Wilken 2003, pp. 94–95. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Trigg 1983, p. 215. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Trigg 1983, p. 215. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Trigg 1983, p. 215. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Trigg 1983, p. 215. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Wilken 2003, p. 95. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Wilken 2003, p. 95. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Grant 1967, p. 552. - Grant, Robert M. (1967), "Origen", in Edwards, Paul (ed.), The Encyclopedia of Philosophy, vol. 5, New York City, New York: The MacMillan Company & The Free Press, pp. 551–552, OCLC 174214019 https://search.worldcat.org/oclc/174214019
Grant 1967, p. 552. - Grant, Robert M. (1967), "Origen", in Edwards, Paul (ed.), The Encyclopedia of Philosophy, vol. 5, New York City, New York: The MacMillan Company & The Free Press, pp. 551–552, OCLC 174214019 https://search.worldcat.org/oclc/174214019
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
McGuckin 2004, p. 33. - McGuckin, John Anthony (2004), "The Scholarly Works of Origen", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 25–44, ISBN 978-0-66422-472-1 https://books.google.com/books?id=riEdrWEDFq0C&q=Origen+ordination&pg=PA13
Thomas 2004, pp. 72–73. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Trigg 1983, pp. 215–216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Trigg 1983, pp. 215–216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Trigg 1983, pp. 215–216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Trigg 1983, p. 216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Wilken 2003, p. 101. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Wilken 2003, p. 101. - Wilken, Robert Louis (2003) [1984], The Christians as the Romans Saw Them, New Haven, Connecticut and London, England: Yale University Press, ISBN 978-0-30009-839-6 https://books.google.com/books?id=TbFfhy510NQC&q=Contra+Celsum
Trigg 1983, p. 216. - Trigg, Joseph Wilson (1983), Origen: The Bible and Philosophy in the Third-Century Church, Atlanta, Georgia: John Knox Press, ISBN 978-0-80420-945-8
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Thomas 2004, p. 72. - Thomas, Stephen (2004), "Celsus", in McGuckin, John Anthony (ed.), The Westminster Handbook to Origen, Louisville, Kentucky: Westminster John Knox Press, pp. 72–73, ISBN 978-0-66422-472-1
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Gregerman 2016, p. 61. - Gregerman, Adam (2016), "Origen's Contra Celsum", Building on the Ruins of the Temple, Texts and Studies in Ancient Judaism, vol. 165, Tübingen, Germany: Mohr Siebeck, pp. 59–96, ISBN 978-3-16154-322-7 https://books.google.com/books?id=SwMj90hQYqMC&q=Contra+Celsum
Hoffmann p.29
Ulrich R. Rohmer (15 January 2014). Ecce Homo: A collection of different views on Jesus. BookRix GmbH & Company KG. p. 98. ISBN 978-3-7309-7603-6. 978-3-7309-7603-6
Hoffmann p.29
Chadwick, H., Origen: Contra Celsum, CUP (1965), p. xxviii. The arguments for the date depend on factors such as the state of the art of gnosticism, possible references to the Augusti, appeals to defense against barbarian invasion, and the possibility of identifying the persecution described by Celsus with a historical one.
Origen, Contra Celsum, preface 4.
Chadwick, H., Origen: Contra Celsum. CUP (1965), 3, 17, 19; 8, 58. He quotes an Egyptian musician named Dionysius in CC 6, 41.
Chadwick, H., Origen: Contra Celsum, CUP (1965), p. xxviii-xxix
Gottheil, Richard; Krauss, Samuel. "Celsus". Jewish Encyclopedia. Retrieved 2007-05-18. http://jewishencyclopedia.com/view.jsp?artid=290&letter=C
Chadwick, H. Origen: Contra Celsum, introduction.
Hanegraaff p.22
Contra Celsum by Origen, Henry Chadwick, 1980, ISBN 0-521-29576-9, page 32 /wiki/ISBN_(identifier)
Patrick, John, The Apology of Origen in Reply to Celsus, 2009, ISBN 1-110-13388-X, pages 22–24, /wiki/ISBN_(identifier)
Hendrik van der Loos (1965). The Miracles of Jesus. Brill Publishers. Retrieved 14 June 2012. According to Celsus Jesus performed His miracles by sorcery (γοητεία); ditto in II, 14; II, 16; II, 44; II, 48; II, 49 (Celsus puts Jesus' miraculous signs on a par with those among men). https://books.google.com/books?id=Qp43AAAAIAAJ&q=according+to+Celsus+Jesus+performed+His+miracles+by+sorcery&pg=PA166
Margaret Y. MacDonald (3 October 1996). Early Christian Women and Pagan Opinion. Cambridge University Press. ISBN 9780521567282. Retrieved 14 June 2012. Celsus calls Jesus a sorcerer. He argues that the miracles of Jesus are on the same level as: 'the works of sorcerers who profess to do wonderful miracles, and the accomplishments of those who are taught by the Egyptians, who for a few obols make known their sacred lore in the middle of the market-place and drive daemons out of men and blow away diseases and invoke the souls of heroes, displaying expensive banquets and dining tables and cakes and dishes which are non-existent, and who make things move as though they were alive although they are not really so, but only appear as such in the imagination.' 9780521567282
Philip Francis Esler (2000). The Early Christian World, Volume 2. Taylor & Francis. ISBN 9780415164979. Retrieved 14 June 2012. To disprove the deity of Christ required an explanation of his miracles which were recorded in scripture. Celsus does not deny the fact of Jesus' miracles, but rather concentrates on the means by which they were performed. Perhaps influenced by rabbinical sources, Celsus attributes Jesus' miracles to his great skills as a magician. 9780415164979
Ernest Cushing Richardson, Bernhard Pick (1905). The Ante-Nicene fathers: translations of the writings of the fathers down to A.D. 325, Volume 4. Scribner's. Retrieved 14 June 2012. But Celsus, wishing to assimilate the miracles of Jesus to the works of human sorcery, says in express terms as follows: "O light and truth! he distinctly declares, with his own voice, as ye yourselves have recorded, that there will come to you even others, employing miracles of a similar kind, who are wicked men, and sorcerers; and Satan. So that Jesus himself does not deny that these works at least are not at all divine, but are the acts of wicked men; and being compelled by the force of truth, he at the same time not only laid open the doings of others, but convicted himself of the same acts. Is it not, then, a miserable inference, to conclude from the same works that the one is God and the other sorcerers? Why ought the others, because of these acts, to be accounted wicked rather than this man, seeing they have him as their witness against himself? For he has himself acknowledged that these are not the works of a divine nature, but the inventions of certain deceivers, and of thoroughly wicked men." https://books.google.com/books?id=ne1YAAAAYAAJ&q=Celsus+miracles+of+Jesus+sorcery&pg=PA450
Origen (30 June 2004). Origen Against Celsus, Volume 2. Kessinger Publishing. ISBN 9781419139161. Retrieved 14 June 2012. But Celsus, wishing to assimilate the miracles of Jesus to the works of human sorcery, says in express terms as follows: "O light and truth! he distinctly declares, with his own voice, as ye yourselves have recorded that there are as ye yourselves have recorded, that there will come to you even others, employing miracles of a similar kind, who are wicked men, and sorcerers; and he calls him who makes use of such devices, one Satan. So that Jesus himself does not deny that these works at least are not at all divine, but are the acts of wicked men; and being compelled by the force of truth, he at the same time not only laid open the doings of others, but convicted himself of the same acts. Is it not, then, a miserable inference, to conclude from the same works that the one is God and the other sorcerers? Why ought the others, because of these acts, to be accounted wicked rather than this man, seeing they have him as their witness against himself? For he has himself acknowledged that these are not the works of a divine nature; but the inventions of certain deceivers, and of thoroughly wicked men." 9781419139161
James D. Tabor, The Jesus Dynasty: The Hidden History of Jesus, His Royal Family, and the Birth of Christianity, Simon and Schuster, 2006. p 64
David Brewster & Richard R. Yeo, The Edinburgh Encyclopaedia, Volume 8, Routledge, 1999. p 362
Bernhard Lang, International Review of Biblical Studies, Volume 54, Publisher BRILL, 2009. p. 401 /wiki/Bernhard_Lang_(biblical_scholar)
Hanegraaff p.22
Hanegraaff p. 38
Martin, Dale B. (2004). Inventing Superstition: From the Hippocratics to the Christians. Cambridge, Massachusetts: Harvard University Press. pp. 141, 143. ISBN 0-674-01534-7. 0-674-01534-7
Terrot Reavely Glover, The Conflict Of Religions In The Early Roman Empire, (Methuen & Co., 1910 [Kindle Edition]), chap. VIII., p. 431
Glover, p. 427
Glover, p. 410
Glover, p. 412
Robert Louis Wilken, The Christians as the Romans Saw Them, (Yale: University Press, 2nd edition, 2003) /wiki/Robert_Louis_Wilken