_Apologeticus_, which Pamphilus wrote in defence of the works of Origen, where we added a brief tract, in which we showed, I think, by unmistakeable proofs, that his books had been corrupted in numerous places by heretics and malevolent persons, and especially those books of which you now require me to undertake the translation, _i.e._ the books which may be entitled _De Principiis_ or _De Principatibus_, and which are indeed in other respects full of obscurities and difficulties. For he there discusses those subjects with respect to which philosophers, after spending all their lives upon them, have been unable to discover anything. But here our author strove, as much as in him lay, to turn to the service of religion the belief in a Creator, and the rational nature of created beings, which the latter had degraded to purposes of wickedness. If, therefore, we have found anywhere in his writings, any statement opposed to that view, which elsewhere in his works he had himself piously laid down regarding the Trinity, we have either omitted it, as being corrupt, and not the composition of Origen, or we have brought it forward, agreeably to the rule which we frequently find affirmed by himself. If, indeed, in his desire to pass rapidly on, he has, as speaking to persons of skill and knowledge, sometimes expressed himself obscurely, we have, in order that the passage might be clearer, added what we had read more fully stated on the same subject in his other works, keeping explanation in view, but adding nothing of our own, but simply restoring to him what was his, although occurring in other portions of his writings.