Whether envy is a kind of sorrow?

Objections

Objection 1 : It would seem that envy is not a kind of sorrow. For the object of envy is a good, for Gregory says (Moral. v, 46) of the envious man that "self-inflicted pain wounds the pining spirit, which is racked by the prosperity of another." Therefore envy is not a kind of sorrow.
Objection 2 : Further, likeness is a cause, not of sorrow but rather of pleasure. But likeness is a cause of envy: for the Philosopher says (Rhet. ii, 10): "Men are envious of such as are like them in genus, in knowledge, in stature, in habit, or in reputation." Therefore envy is not a kind of sorrow.
Objection 3 : Further, sorrow is caused by a defect, wherefore those who are in great defect are inclined to sorrow, as stated above (FS, Question [47], Article [3]) when we were treating of the passions. Now those who lack little, and who love honors, and who are considered wise, are envious, according to the Philosopher (Rhet. ii, 10). Therefore envy is not a kind of sorrow.
Objection 4 : Further, sorrow is opposed to pleasure. Now opposite effects have not one and the same cause. Therefore, since the recollection of goods once possessed is a cause of pleasure, as stated above (FS, Question [32], Article [3]) it will not be a cause of sorrow. But it is a cause of envy; for the Philosopher says (Rhet. ii, 10) that "we envy those who have or have had things that befitted ourselves, or which we possessed at some time." Therefore sloth is not a kind of sorrow.