A complex interesting perception may accordingly be composed either, 1. Of pleasures alone: 2. Of pains alone: or, 3. Of a pleasure or pleasures, and a pain or pains together. What determines a lot of pleasure, for example, to be regarded as one complex pleasure, rather than as divers simple ones, is the nature of the exciting cause. Whatever pleasures are excited all at once by the action of the same cause, are apt to be looked upon as constituting all together but one pleasure.

II. The several simple pleasures of which human nature is susceptible, seem to be as follows: 1. The pleasures of sense. 2. The pleasures of wealth. 3. The pleasures of skill. 4. The pleasures of amity. 5. The pleasures of a good name. 6. The pleasures of power. 7. The pleasures of piety. 8. The pleasures of benevolence. 9. The pleasures of malevolence. 10. The pleasures of memory. 11. The pleasures of imagination. 12. The pleasures of expectation.