(b) Evil may be desired, if the intention takes in only the good of public or of private utility that is contained in it, as when one hopes a jury will find a dangerous criminal guilty, if one has in view, not the sufferings or death of the criminal, but the safety of the community. It is right, therefore, to wish confusion and defeat to the enemies of religion, of the Church, or of one’s country; it is lawful to pray God to visit a sinner with sickness that he may thereby be reformed or prevented from harming others. But in wishing evils one must remember that it is not always lawful to do what one wishes may happen in some lawful manner, nor is it lawful to wish a greater evil as a means of escape from a lesser evil (see 1308 sqq.).
2113. Sinfulness of Cursing.—Cursing a person is sinful when the evil ordered or wished is intended precisely as it is the hurt or loss of this person.
(a) From its nature this sin is mortal, since it shuts out the curser from heaven (“Neither cursers nor extortioners shall possess the kingdom of God,” I Cor., vi. 10), and it is essentially opposed to charity, being the natural expression of hatred (see 1296). But, other things being equal, optative cursing is less serious than defamation, for it is less harm to another to wish him evil (e.g., that he be defamed) than to inflict that evil on him.
(b) From the imperfection of the act or the lightness of the matter, cursing becomes at times a venial sin. The act is imperfectly deliberate when one curses in a sudden fit of temper; it is imperfectly intentional, when one curses in fun or from habit and does not really wish that the evils pronounced should be fulfilled. The curses, “Go to hell,” “God damn you,” are usually not meant or understood to express a wish that the person addressed be consigned to eternal punishment. Hence, they are generally in themselves venial sins only. But it should be remembered that venial curses of this kind may become mortal by reason of scandal (e.g., when parents habitually address such curses to their children, or other superiors to their subordinates), or by reason of irreverence (e.g., when children curse their parents). The matter of a curse is light when the evil spoken is harmful only in a small degree (e.g., to wish that a person may lose a small sum of money).
2114. Rules for Deciding as to Gravity of the Sin.—Persons who have expressed a grave curse against a neighbor are sometimes in doubt whether there was enough ill-will in the curse to make it a mortal sin. For such doubts theologians give the following rules:
(a) if the reason for doubting is that after the curse one cooled off and hoped that no evil would happen to one’s neighbor, mortal sin was committed during the curse, but the bad disposition quickly passed away;
(b) if the reason for doubting is that one is not sure about the state of mind one was in during the curse, a good index of that state of mind will be the feeling one has towards the person who was cursed. Thus, if one is well disposed towards that person, the presumption is that the curse was not meant except as an expression of anger; but if one is hostile to that person, the presumption is rather that the evil in the curse was really intended. If one is indifferent as regards the person whom one cursed, the presumption will follow what one is accustomed to desire in one’s curses, whether that be to give forceful expression to displeasure or to manifest a malevolent hatred.
2115. Circumstances Which Change the Moral Species of Cursing.—There are certain circumstances of person and objects which change the moral species of cursing, and which must therefore be mentioned in confession.
(a) Thus, by reason of difference in the persons cursed the species is changed, for where special love or reverence is owed a special sin is committed by hatred or irreverence. The gravest curse is that against God, which is the sin of blasphemy (see 887 sqq.). Next in wickedness is the curse against one’s parents, which is a sin of impiety.
(b) By reason of difference in the evils that are desired, the species is also changed, since the essential malices of the will and of the deed are the same (see 90, 242). In this respect cursing differs from contumely and detraction, for in these sins the evils spoken are not pleasing, but rather displeasing to the speaker (see 2103). Hence, he who wishes death to his neighbor commits murder in his heart, he who wishes loss of property is a thief at heart, etc. But if one curses a neighbor in a general way, without mentioning any particular evil, one sins by hatred.