Thus, there are four perturbations, and but three calm rational emotions; for grief has no exact opposite.
VII.

But they insist upon it that all perturbations depend on opinion and judgment; therefore they define them more strictly, in order not only the better to show how blamable they are, but to discover how much they are in our power.

Grief, then, is a recent opinion of some present evil, in which it seems to be right that the mind should shrink and be dejected.

Joy is a recent opinion of a present good, in which it seems to be right that the mind should be elated.

Fear is an opinion of an impending evil which we apprehend will be intolerable.