Modi cogitandi ut amor, cupiditas vel quicunque nomine affectus animi insigniuntur, non dantur nisi in eodem individuo detur idea rei amatæ, desideratæ etc. At idea dari potest quamvis nullus alius detur cogitandi modus.
English (Elwes 1883)
Modes of thinking, such as love, desire, or any other of the passions, do not take place, unless there be in the same individual an idea of the thing loved, desired, &c. But the idea can exist without the presence of any other mode of thinking.
Modern English
Modes of thinking such as love, desire, or whatever else is designated by the name of an affect of the mind, do not occur unless there is in the same individual an idea of the thing loved, desired, and so on. But an idea can exist even when no other mode of thinking exists.