2. You, however, beloved and most truly longed-for, have done what befitted the tradition of the Church and your piety toward the Lord, in refuting, admonishing, and rebuking such men. But since, instigated by their father the devil, ‘they knew not nor understood,’ as it is written, ‘but go on still in darkness,’ let them learn from your piety that this error of theirs belongs to Valentinus and Marcion, and to Manichæus, of whom some substituted [the idea of] Appearance for Reality, while the others, dividing what is indivisible, denied the truth that ‘the Word was made Flesh, and dwelt among us.’ Why then, as they hold with those people, do they not also take up the heritage of their names? For it is reasonable, as they hold their error, to have their names as well, and for the future to be called Valentinians, Marcionists, and Manichæans. Perhaps even thus, being put to shame by the ill savour of the names, they may be enabled to perceive into what a depth of impiety they have fallen. And it would be within our rights not to answer them at all, according to the apostolic advice: ‘A man that is heretical, after a first and second admonition refuse, knowing that such an one is perverted, and sinneth, being self-condemned;’ the more so, in that the Prophet says about such men: ‘The fool shall utter foolishness, and his heart shall imagine vain things.’ But since, like their leader, they too go about like lions seeking whom among the simple they shall devour, we are compelled to write in reply to your piety, that the brethren being once again instructed by your admonition may still further reprobate the vain teaching of those men.