9 The folly also of their contention that certain heretics and ill-disposed persons have tampered with Origen's writings may be shown thus. Could any person be more wise, more learned, or more eloquent than were Eusebius and Didymus, Origen's supporters? Of these the former in the six volumes of his Apology asserts that Origen is of the same mind with himself; while the latter, though he tries to excuse his errors, admits that he has made them. Not being able to deny what he finds written, he endeavours to explain it away.
It is one thing to say that additions have been made by heretics, but another to maintain that heretical statements are commendable. Origen's case would be unique if his writings were falsified all over the world and if in one day by an edict like that of Mithridates all the truth were shorn from his volumes. Even supposing that some one treatise of his has been tampered with, can it be possible that all his works, published as they were at different times and places, have been corrupted?
Origen himself in a letter written to Fabian, bishop of Rome, expresses penitence for having made erroneous statements, and charges Ambrose with over haste in making public what was meant only for private circulation. And yet to this day his disciples search for shifts to prove that all that excites disapprobation in his writings is due not to him but to others.
Source: Letters (New Advent)