Reply Obj. 1: Pleasure is caused by good, which has only one meaning: and so pleasure is not divided into several species as sorrow is; for the latter is caused by evil, which "happens in many ways," as Dionysius says (Div. Nom. iv).
Reply Obj. 2: Repentance is for one's own evil, which is the proper object of sorrow: wherefore it does not belong to these species. Jealousy and indignation are included in envy, as we shall explain later (II-II, Q. 36, A. 2).
Reply Obj. 3: This division is not according to opposite species; but according to the diversity of foreign matter to which the notion of sorrow is applied, as stated above. ________________________
QUESTION 36
OF THE CAUSES OF SORROW OR PAIN
(In Four Articles)
We must now consider the causes of sorrow: under which head there are four points of inquiry:
(1) Whether sorrow is caused by the loss of a good or rather by the presence of an evil?
(2) Whether desire is a cause of sorrow?
(3) Whether the craving for unity is a cause of sorrow?
(4) Whether an irresistible power is a cause of sorrow? ________________________