BOOK III, PROP. XXXVI. He who remembers a thing, in which he has once taken delight, desires to possess it under the same circumstances as when he first took delight therein.

Corollary.–A lover will, therefore, feel pain if one of the aforesaid attendant circumstances be missing.

Note.–This pain, in so far as it has reference to the absence of the object of love, is called Regret.