Egoism, (from Latin ego, I), in philosophy, an ethical theory holding that the good is based on the pursuit of self-interest. The word is sometimes misused for egotism, the overstressing of ones own worth.

Egoist doctrines are less concerned with the philosophic problem of what is the self than with the common notions of a person and his concerns. They see perfection sought through the furthering of a mans own welfare and profitallowing, however, that sometimes he may not know where these lie and must be brought to recognize them.

Many ethical theories have an egoist bias. The hedonism of the ancient Greeks bids each man to seek his own greatest happiness; in the 17th century, Thomas Hobbes, a Materialist, and Benedict de Spinoza, a Rationalist, held in different ways that self-preservation is the good; and those who stress the tending of ones own conscience and moral growth are likewise egoists in this sense. In contrast with such views is an ethics that is governed more by mans social aspects, which stresses the importance of the community rather than that of the individual. Under this head come such theories as Stoic cosmopolitanism, tribal solidarity, and utilitarianism, which are all forms of what the positivist Auguste Comte called altruism. The distinction, however, cannot always be neatly drawn.

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Egoism | philosophy | Britannica.com