Take a swim at Tiber River . In a broad use of the term any system might be called egoistic which makes any good of the ego the end and motive of action. The name, however, has been appropriated by usage to those systems which make happiness, pleasure, or personal advantage the sole end of conduct. Its typical expression is to be found in Hobbes and Mandeville, while Jeremy Bentham, combining it with the other cognate principle, that pleasure and pain are the only good and evil, formulates it in its full character as egoistic hedonism. Two of Bentham's statements, when taken together, set forth concisely the egoistic doctrine.
Pleasure is itself a good, nay, setting aside immunity from pain, the only good.
Pain is in itself an evil, and indeed without exception, the only evil, or else the words good and evil, have no meaning. The search after motives is one of the prominent causes of man's bewilderment in the investigation of the question of morals. But this is a pursuit in which every moment employed is a moment wasted. All motives are absolutely good, no man has ever had, can, or could have a motive different from the pursuit of pleasure or shunning of pain. The undisputed fact that men do experience sentiments of benevolence and perform disinterested actions offers an obvious difficulty to the egoist.