Thirdly, anger may be considered as proceeding to deeds; and thus anger gives rise to "quarrels," by which we are to understand all manner of injuries inflicted on one's neighbor through anger.
Reply Obj. 1: The blasphemy into which a man breaks out deliberately proceeds from pride, whereby a man lifts himself up against God: since, according to Ecclus. 10:14, "the beginning of the pride of man is to fall off from God," i.e. to fall away from reverence for Him is the first part of pride [*Cf. Q. 162, A. 7, ad 2]; and this gives rise to blasphemy. But the blasphemy into which a man breaks out through a disturbance of the mind, proceeds from anger.
Reply Obj. 2: Although hatred sometimes arises from anger, it has a previous cause, from which it arises more directly, namely displeasure, even as, on the other hand, love is born of pleasure. Now through displeasure, a man is moved sometimes to anger, sometimes to hatred. Wherefore it was fitting to reckon that hatred arises from sloth rather than from anger.
Reply Obj. 3: Swelling of the mind is not taken here as identical with pride, but for a certain effort or daring attempt to take vengeance; and daring is a vice opposed to fortitude. _______________________
EIGHTH ARTICLE [II-II, Q. 158, Art. 8]
Whether There Is a Vice Opposed to Anger Resulting from Lack of Anger?
Objection 1: It would seem that there is not a vice opposed to anger, resulting from lack of anger. For no vice makes us like to God. Now by being entirely without anger, a man becomes like to God, Who judges "with tranquillity" (Wis. 12:18). Therefore seemingly it is not a vice to be altogether without anger.
Obj. 2: Further, it is not a vice to lack what is altogether useless. But the movement of anger is useful for no purpose, as Seneca proves in the book he wrote on anger (De Ira i, 9, seqq.). Therefore it seems that lack of anger is not a vice.
Obj. 3: Further, according to Dionysius (Div. Nom. iv), "man's evil is to be without reason." Now the judgment of reason remains unimpaired, if all movement of anger be done away. Therefore no lack of anger amounts to a vice.
On the contrary, Chrysostom [*Hom. xi in Matth. in the Opus Imperfectum, falsely ascribed to St. John Chrysostom] says: "He who is not angry, whereas he has cause to be, sins. For unreasonable patience is the hotbed of many vices, it fosters negligence, and incites not only the wicked but even the good to do wrong."