Front Page Titles (by Subject) QUESTION LXXVI.: OF CURSING. - Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 2 (Summa Theologica - Secunda Secundae Pt.2)
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QUESTION LXXVI.: OF CURSING. - St. Thomas Aquinas, Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 2 (Summa Theologica - Secunda Secundae Pt.2) 
Aquinas Ethicus: or, the Moral Teaching of St. Thomas. A Translation of the Principal Portions of the Second part of the Summa Theologica, with Notes by Joseph Rickaby, S.J. (London: Burns and Oates, 1892).
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Article I.—Is it lawful to curse any one?
R. To do a thing and to wish it are two acts that wait on one another for good and evil. Hence if a man commands or wishes the evil of another man in so far as it is evil, intending the evil itself, the utterance of such a command or wish for evil will be unlawful, and this utterance is cursing, ordinarily so called. But if a man commands or wishes the evil of another under the aspect in which it is good, that is lawful; and the utterance of such a wish will not be cursing, ordinarily so called, but only incidentally, because the principal intention of the speaker tends not to evil but to good. Now evil may be uttered in the way of a command or a wish under two aspects of good. Sometimes it is under the aspect of justice: thus a judge lawfully dooms him on whom he orders a just punishment to be inflicted. So also the Church pronounces a curse in her anathemas; and the Prophets in Scripture imprecate evil on sinners. Therein the Prophets speak as conforming their will to the divine justice; though these imprecations may also be understood as predictions. Sometimes again evil is uttered under the aspect of utility; as when one wishes a sinner to suffer a sickness, or have some other obstacle thrown in his way, either for his personal improvement, or at least to keep him from hurting others.
Article III.—Is cursing a mortal sin?
R. By cursing we here understand the denouncing of evil upon another, by way either of command or wish. Now to wish or to move by command to another’s evil is of itself repugnant to that charity with which we love our neighbour and wish his good; and therefore is a mortal sin of its kind, and all the more grievous, the more we are bound to love and reverence the person whom we curse. At times however the utterance of a curse is a venial sin, either from the trifling nature of the evil imprecated, or for the disposition of the utterer, who says such things with small animus, or in jest, or by surprise. For sins of word are weighed principally according to the disposition in which they are uttered.