Thomas Aquinas

“ Reviling is not directed to the end of pride which is excellency. Hence reviling does not arise directly from pride. Nevertheless pride disposes a man to revile, in so far as those who think themselves to excel, are more prone to despise others and inflict injuries on them, because they are more easily angered, through deeming it an affront to themselves whenever anything is done against their will. ”

“ Nevertheless there is need of discretion in such matters, and one should use such words with moderation, because the railing might be so grave that being uttered inconsiderately it might dishonor the person against whom it is uttered. In such a case a man might commit a mortal sin, even though he did not intend to dishonor the other man: just as were a man incautiously to injure grievously another by striking him in fun, he would not be without blame. ”

“ Since the sin of railing or reviling depends on the intention of the utterer, it may happen to be a venial sin, if it be a slight railing that does not inflict much dishonor on a man, and be uttered through lightness of heart or some slight anger, without the fixed purpose of dishonoring him, for instance when one intends by such a word to give but little pain.
Art. 3 - Whether one ought to suffer oneself to be reviled? Objection 1: It would seem that one ought not to suffer oneself to be reviled. For he that suffers himself to be reviled, encourages the reviler. ”

“ It belongs to wittiness to utter some slight mockery, not with intent to dishonor or pain the person who is the object of the mockery, but rather with intent to please and amuse: and this may be without sin, if the due circumstances be observed. On the other hand if a man does not shrink from inflicting pain on the object of his witty mockery, so long as he makes others laugh, this is sinful, as stated in the passage quoted. ”

“ Just as it is lawful to strike a person, or damnify him in his belongings for the purpose of correction, so too, for the purpose of correction, may one say a mocking word to a person whom one has to correct. ”

“ Secondly, there is the fault of both guilt and punishment, which is exposed by "taunts" [convicium] , because "vice" is commonly spoken of in connection with not only the soul but also the body. Hence if one man says spitefully to another that he is blind, he taunts but does not revile him: whereas if one man calls another a thief, he not only taunts but also reviles him. ”

“ According to the Philosopher (Ethic. vii, 6) "anger listens imperfectly to reason": wherefore an angry man suffers a defect of reason, and in this he is like the foolish man. Hence reviling arises from folly on account of the latter's kinship with anger.
Reply to Objection 3: According to the Philosopher (Rhet. ii, 4) "an angry man seeks an open offense, but he who hates does not worry about this." Hence reviling which denotes a manifest injury belongs to anger rather than to hatred. ”

“ Such is the harm done to a man to the detriment of his honor, or of the respect due to him from others. Hence the reviling is greater if one man reproach another in the presence of many: and yet there may still be reviling if he reproach him by himself. in so far as the speaker acts unjustly against the respect due to the hearer.
Reply to Objection 2: One man slights another by deeds in so far as such deeds cause or signify that which is against that other man's honor. ”