For there is no such Finis Ultimus, (utmost aim,) nor Summum Bonum, (greatest good,) as is spoken of in the books of the old moral philosophers. Nor can a man any more live, whose desires are at an end, than he whose senses and imaginations are at a stand. Felicity is a continual progress of the desire, from one object to another; the attaining of the former, being still but the way to the latter.
Leviathan, social contract