Rufinus's Epilogue to Pamphilus the Martyr's Apology for Origen
Bishop Damasus, at the time when a consultation was held in the matter of the reconciling of the followers of Apollinarius to the church, desired to have a document setting forth the faith of the church, which should be subscribed by those who wished to be reconciled. The compiling of this document he entrusted to a certain friend of his, a presbyter and a highly accomplished man, who usually acted for him in matters of this kind. When he came to compose the document, he found it necessary, in speaking of the Incarnation of our Lord, to apply to him the expression Homo Dominicus. The Apollinarists took offense at this expression, and began to impugn it as a novelty. The writer of the document thereupon undertook to defend himself, and to confute the objectors by the authority of ancient Catholic writers; and he happened to show to one of those who complained of the novelty of the expression a book of the bishop Athanasius in which the word which was under discussion occurred. The man to whom this evidence was offered appeared to be convinced, and asked that the manuscript should be lent to him so that he might convince the rest who from their ignorance were still maintaining their objections. When he had got the manuscript into his hands he devised a perfectly new method of falsification. He first erased the passage in which the expression occurred, and then wrote in again the same words which he had erased. He returned the paper, and it was accepted without question. The controversy about this expression again arose; the manuscript was brought forward: the expression in question was found in it, but in a position where there had been an erasure: and the man who had brought forward such a manuscript lost all authority, since the erasure seemed to be the proof of malpractice and falsification. However, in this case as in one which I mentioned before, it was a living man who was thus treated by a living man, and he at once did all in his power to lay bare the iniquitous fraud which had been committed, and to remove the stain of this nefarious act from the man who was innocent and had done no evil of the kind, and to attach it to the real author of the deed, so that it should completely overwhelm him with infamy.
Since, then, Origen in his letter complains with his own voice that he has suffered such things at the hands of the heretics who wished him ill, and similar things have happened in the case of many other orthodox men among both the dead and the living, and since in the cases adduced, men's writings are proved to have been tampered with in a similar way: what determined obstinacy is this, which refuses to admit the same excuse when the case is the same, and, when the circumstances are parallel, assigns to one party the allowance due to respect, but to another infamy due to a criminal. The truth must be told, and must not lie hid at this point; for it is impossible for any man really to judge so unjustly as to form different opinions on cases which are similar. The fact is that the prompters of Origen's accusers are men who make long controversial discourses in the churches, and even write books the whole matter of which is borrowed from him, and who wish to deter men of simple mind from reading him, for fear that their plagiarisms should become widely known, though, indeed, their appropriations would be no reproach to them if they were not ungrateful to their master.
For instance, one of these men, who thinks that a necessity is laid upon him, like that of preaching the Gospel, to speak evil of Origen among all nations and tongues, declared in a vast assembly of Christian hearers that he had read six thousand of his works. Surely, if his object in reading these were, as he is in the habit of asserting, only to acquaint himself with Origen's faults, ten or twenty or at most thirty of these works would have sufficed for the purpose. But to read six thousand books is no longer wishing to know the man, but giving up almost one's whole life to his teaching and researches. On what ground then can his words be worthy of credit when he blames men who have only read quite a few of these books while their rule of faith is kept sacred and their piety unimpaired.
What has been said may suffice to show what opinion we ought to form of the books of Origen. I think that every one who has at heart the interests of truth, not of controversy, may easily assent to the well-proved statements I have made. But if any man perseveres in his contentiousness, we have no such custom. It is a settled custom among us, when we read him, to hold fast that which is good, according to the apostolic injunction. If we find in these books anything discrepant to the Catholic faith, we suspect that it has been inserted by the heretics, and consider it as alien from his opinion as it is from our faith. If, however, this is a mistake of ours, we run, as I think, no danger from such an error; for we ourselves, through God's help, continue unharmed by avoiding what we hold in suspicion and condemn: and further we shall not be accounted accusers of our brethren before God (you will remember that the accusing of the brethren is the special work of the devil, and that he received the name of devil from his being a slanderer). Moreover, we thus escape the sentence pronounced on evil speakers, which separates those who are such from the kingdom of God.
Source: Prefaces and Other Works (New Advent)