3 He was pleased to begin with commending my manner of life, which he said he had come to know through your statements (in which I am sure there was more kindness than truth), adding that he had remarked to you that I might have done well all the things which you had told him of me, if I had done them within the Church. I thereupon asked him what was the Church within which it was the duty of a man so to live; whether it was that one which, as Sacred Scripture had long foretold, was spread over the whole world, or that one which a small section of Africans, or a small part of Africa, contained. To this he at first attempted to reply, that his communion was in all parts of the earth. I asked him whether he was able to issue letters of communion, which we call regular, to places which I might select; and I affirmed, what was obvious to all, that in this way the question might be most simply settled. In the event of his agreeing to this, my intention was that we should send such letters to those churches which we both knew, on the authority of the apostles, to have been already founded in their time.
4. As the falsity of his statement, however, was apparent, a hasty retreat from it was made in a cloud of confused words, in the midst of which he quoted the Lord's words: “Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. You shall know them by their fruits.” When I said that these words of the Lord might also be applied by us to them, he went on to magnify the persecution which he affirmed that his party had often suffered; intending thereby to prove that his party were Christians because they endured persecution. When I was preparing, as he went on with this, to answer him from the Gospel, he himself anticipated me in bringing forward the passage in which the Lord says: “Blessed are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.” Thanking him for the apt quotation, I immediately added that this behooved therefore to be inquired into, whether they had indeed suffered persecution for righteousness' sake. In following up this inquiry I wished this to be ascertained, though indeed it was patent to all, whether the persecutions under Macarius fell upon them while they were within the unity of the Church, or after they had been severed from it by schism; so that those who wished to see whether they had suffered persecution for righteousness' sake might turn rather to the prior question, whether they had done rightly in cutting themselves off from the unity of the whole world. For if they were found in this to have done wrong, it was manifest that they suffered persecution for unrighteousness' sake rather than for righteousness' sake, and could not therefore be numbered among those of whom it is said, “Blessed are they which are persecuted for righteousness' sake.” Thereupon mention was made of the surrender of the sacred books, a matter about which much more has been spoken than has ever been proved true. On our side it was said in reply, that their leaders rather than ours had been traditors; but that if they would not believe the documents with which we supported this charge, we could not be compelled to accept those which they brought forward.
Source: Letters (New Advent)