4 What must I do then? Deny that I am of Origen's opinion? They will not believe me. Swear that I am not? They will laugh and say that I deal in lies. I will do the one thing which they dread. I will bring forward their sacred rites and mysteries, and will expose the cunning whereby they delude simple folk like myself. Perhaps, although they refuse credence to my voice when I deny, they may believe my pen when I accuse. Of one thing they are particularly apprehensive, and that is that their writings may some day be taken as evidence against their master.
They are ready to make statements on oath and to disclaim them afterwards with an oath as false as the first. When asked for their signatures they use shifts and seek excuses. One says: “I cannot condemn what no one else has condemned.” Another says: “No decision was arrived at on the point by the Fathers.” It is thus that they appeal to the judgment of the world to put off the necessity of assenting to a condemnation. Another says with yet more assurance: “how am I to condemn men whom the council of Nicæa has left untouched?
For the council which condemned Arius would surely have condemned Origen too, had it disapproved of his doctrines.” They were bound in other words to cure all the diseases of the church at once and with one remedy; and by parity of reasoning we must deny the majesty of the Holy Ghost because nothing was said of his nature in that council. But the question was of Arius, not of Origen; of the Son, not of the Holy Ghost. The bishops at the council proclaimed their adherence to a dogma which was at the time denied; they said nothing about a difficulty which no one had raised.
And yet they covertly struck at Origen as the source of the Arian heresy: for, in condemning those who deny the Son to be of the substance of the Father, they have condemned Origen as much as Arius. On the ground taken by these persons we have no right to condemn Valentine, Marcion, or the Cataphrygians, or Manichæus, none of whom are named by the council of Nicæa, and yet there is no doubt that in time they were prior to it. But when they find themselves pressed either to subscribe or to leave the Church, you may see some strange twisting.
They qualify their words, they arrange them anew, they use vague expressions; so as, if possible, to hold both our confession and that of our opponents, to be called indifferently heretics and Catholics. As if it were not in the same spirit that the Delphian Apollo (or, as he is sometimes called, Loxias) gave his oracles to Crœsus and to Pyrrhus; cheating with a similar device two men widely separated in time. To make my meaning clear I will give a few examples.
Source: Letters (New Advent)