15 For see what they do and what they suffer. They slay souls, they suffer in body: they cause everlasting deaths, and yet they complain that they themselves suffer temporal deaths. And yet what deaths do they suffer? They allege to us some martyrs of theirs in persecution. See, Marculus was hurled headlong from a rock; see, Donatus of Bagaia was thrown into a well. When have the Roman authorities decreed such punishments as casting men down rocks? But what do those of our party reply?
What was done I know not; what however do ours tell? That they flung themselves headlong and cast the infamy of it upon the authorities. Let us call to mind the custom of the Roman authorities, and see to whom we are to give credit. Our men declare that those men cast themselves down headlong. If they are not the very disciples of those men, who now cast themselves down precipices, while no man persecutes them, let us not credit the allegation of our men: what wonder if those men did what these are wont to do?
The Roman authorities never did employ such punishments: for had they not the power to put them to death openly? But those men, while they wished to be honored when dead, found not a death to make them more famous. In short, whatever the fact was, I do not know. And even if you have suffered corporal affliction, O party of Donatus, at the hand of the Catholic Church, as an Hagar you have suf fered it at the hand of Sarah; “return to your mistress.” A point which it was indeed necessary to discuss has detained us somewhat too long to be at all able to expound the whole text of the Gospel Lesson.
Let this suffice you in the meantime, beloved brethren, lest, by speaking of other matters, what has been spoken might be shut out from your hearts. Hold fast these things, declare such things; and while yourselves are inflamed, go your way there, and set on fire them that are cold.
Source: Tractates on the Gospel of John (New Advent)