According to the Christian father Origen, Celsus (/ˈsɛlsəs/; Greek: ΚέΛΣΟς. K�lsos) was a 2nd-century Greek philosopher and opponent of Early Christianity. He is known for his literary work, The True Word (also Account, Doctrine or Discourse; Greek: ΛόΓΟς ἈΛΗ&thΗής), which survives exclusively in Origen's quotations from it in Contra Celsum. This work, c. 177 is the earliest known comprehensive attack on Christianity.According to Origen, Celsus was the author of an anti-Christian work titled The True Word (Alēthēs logos). This work was lost, but we have Origen's account of it in his writings. It was during the reign of Philip the Arab that Origen received this work for rebuttal. Origen's refutation of The True Word contained its text, interwoven with Origen's replies. Origen's work has survived and thereby preserved Celsus' work with it.Celsus seems to have been interested in Ancient Egyptian religion, and he seemed to know of Hellenistic Jewish logos-theology, both of which suggest The True Word was composed in Alexandria. Celsus wrote at a time when Christianity purportedly was being persecuted and when there seems to have been more than one emperor.As an anti-Christian Greek philosopher, Celsus mounted an attack on Christianity. Celsus wrote that some Jews said Jesus' father was a Roman soldier named Pantera. The views of Celsus drew responses from Origen who considered it a fabricated story. Raymond E. Brown states that the story of Pantera is a fanciful explanation of the birth of Jesus which includes very little historical evidence--Brown's analysis does not presuppose the doctrine of the "virgin birth", but cites the lack of historical evidence for Celsus' assertion. In addition, Celsus addressed the miracles of Jesus, holding that "Jesus performed His miracles by sorcery (ΓΟΗΤΕίΑ)".

This is a highly controversial exposition of a doctrine which has dominated Christianity for two thousand years. The book takes apart, piece by piece, the very foundation that so many religions use to support the belief that there are three persons in one God. It analyses the major scriptural references pointed to in Trinity support texts, and examines them in the light of biblical context and by original-language comparisons. World-renowned authorities on biblical Hebrew and Greek are sought for their views on these key scriptures. This is a compelling book which turns the very foundation of Christianity onto its head.

This book offers an engrossing portrayal of the early years of the Christian movement from the perspective of the Romans.