He therefore that intends to abuse others must not be witty and noisy and impudent, but a man that does not lie open to counter-abuse and retort, for the god seems to have enjoined upon no one the precept "Know thyself" so much as on the person who is censorious, to prevent people saying just what they please, and hearing what don't please them. For such a one is wont, as Sophocles17 says, "idly letting his tongue flow, to hear against his will, what he willingly says ill of others."
§ vi. This use and advantage then there is in abusing one's enemy, and no less arises from being abused and ill-spoken of oneself by one's enemies. And so Antisthenes18 said well that those who wish to lead a good life ought to have genuine friends or red-hot enemies; for the former deterred you from what was wrong by reproof, the latter by abuse. But since friendship has nowadays become very mealy-mouthed in freedom of speech, voluble in flattery and silent in rebuke, we can only hear the truth from our enemies. For as Telephus19 having no surgeon of his own, submitted his wound to be cured by his enemy's spear, so those who cannot procure friendly rebuke must content themselves with the censure of an enemy that hates them, reprehending and castigating their vices, and regard not the animus of the person, but only his matter. For as he who intended to kill the Thessalian Prometheus20 only stabbed a tumour, and so lanced it that the man's life was saved, and he was rid of the tumour by its bursting, so oftentimes abuse, suddenly thrust on a man in anger or hatred, has cured some disease in his soul which he was ignorant of or neglected. But most people when they are abused do not consider whether the abuse really belongs to them properly, but look round to see what abuse they can heap on the abuser, and, as wrestlers get smothered with the dust of the arena, do not wipe off the abuse hurled at themselves, but bespatter others, and at last get on both sides grimy and discoloured. But if anyone gets a bad name from an enemy, he ought to clear himself of the imputation even more than he would remove any stain on his clothes that was pointed out to him; and if it be