7 Thereafter he began to insist upon my answering categorically this question: Whether I thought the persecutor or the persecuted to be in the right? To which I answered, that the question was not fairly stated: it might be that both were in the wrong, or that the persecution might be made by the one who was the more righteous of the two parties; and therefore it was not always right to infer that one is on the better side because he suffers persecution, although that is almost always the case. When I perceived that he still laid great stress upon this, wishing to have the justice of the cause of his party acknowledged as beyond dispute because they had suffered persecution, I asked him whether he believed Ambrose, bishop of the Church of Milan, to be a righteous man and a Christian? He was compelled to deny expressly that that man was a Christian and a righteous man; for if he had admitted this, I would at once have objected to him that he esteemed it necessary for him to be rebaptized. When, therefore, he was compelled to pronounce concerning Ambrose that he was not a Christian nor a righteous man, I related the persecution which he endured when his church was surrounded with soldiers. I also asked whether Maximianus, who had made a schism from their party at Carthage, was in his view a righteous man and a Christian. He could not but deny this. I therefore reminded him that he had endured such persecution that his church had been razed to the foundations. By these instances I laboured to persuade him, if possible, to give up affirming that the suffering of persecution is the most infallible mark of Christian righteousness.
8. He also related that, in the infancy of their schism, his predecessors, being anxious to devise some way of hushing up the fault of Cæcilianus, lest a schism should take place, had appointed over the people belonging to his communion in Carthage an interim bishop before Majorinus was ordained in opposition to Cæcilianus. He alleged that this interim bishop was murdered in his own meeting house by our party. This, I confess, I had never heard before, though so many charges brought by them against us have been refuted and disproved, while by us greater and more numerous crimes have been alleged against them. After having narrated this story, he began again to insist on my answering whether in this case I thought the murderer or the victim the more righteous man; as if he had already proved that the event had taken place as he had stated. I therefore said that we must first ascertain the truth of the story, for we ought not to believe without examination all that is said: and that even were it true, it was possible either that both were equally bad, or that one who was bad had caused the death of another yet worse than himself. For, in truth, it is possible that his guilt is more heinous who rebaptizes the whole man than his who kills the body only.
9. After this there was no occasion for the question which he afterwards put to me. He affirmed that even a bad man should not be killed by Christians and righteous men; as if we called those who in the Catholic Church do such things righteous men: a statement, moreover, which it is more easy for them to affirm than to prove to us, so long as they themselves, with few exceptions, bishops, presbyters, and clergy of all kinds, go on gathering mobs of most infatuated men, and causing, wherever they are able, so many violent massacres, and devastations to the injury not of Catholics only, but sometimes even of their own partisans. In spite of these facts, Fortunius, affecting ignorance of the most villanous doings, which were better known by him than by me, insisted upon my giving an example of a righteous man putting even a bad man to death. This was, of course, not relevant to the matter in hand; for I conceded that wherever such crimes were committed by men having the name of Christians, they were not the actions of good men. Nevertheless, in order to show him what was the true question before us, I answered by inquiring whether Elijah seemed to him to be a righteous man; to which he could not but assent. Thereupon I reminded him how many false prophets Elijah slew with his own hand. He saw plainly herein, as indeed he could not but see, that such things were then lawful to righteous men. For they did these things as prophets guided by the Spirit and sanctioned by the authority of God, who knows infallibly to whom it may be even a benefit to be put to death. He therefore required me to show him one who, being a righteous man, had in the New Testament times put any one, even a criminal and impious man, to death.
Source: Letters (New Advent)