“The world is so unhappy because it is ignorant of the true Self. Man's real nature is happiness. Happiness is inborn in the true Self. Man's search for happiness is an unconscious search for his true Self. The true Self is imperishable; therefore, when a man finds it, he finds a happiness which does not come to an end.”
Abide as the Self
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Ramana Maharshi 75
Indian religious leader 1879–1950Related quotes

1900s, Address at the Prize Day Exercises at Groton School (1904)
Context: If there ever was a pursuit which stultified itself by its very conditions, it is the pursuit of pleasure as the all-sufficing end of life. Happiness can not come to any man capable of enjoying true happiness unless it comes as the sequel to duty well and honestly done. To do that duty you need to have more than one trait.
The Essence of Life (1980), also in Minor Works II (2001), p. 131f

Source: Quoted in: Kabir, Hajara Muhammad,. Northern women development. [Nigeria]. p, 351. ISBN 978-978-906-469-4. OCLC 890820657.

No. 15 (March 17, 1711).
The Spectator (1711–1714)

Outline of a Morality Without Obligation or Sanction https://www.marxists.org/archive/guyau/1885/morality.htm (1885).
Context: A third equivalent of duty is borrowed from sensibility and not, like the preceding, from intelligence and activity. It’s the growing fusion of sensibilities, and the ever increasing sociable character of elevated pleasures, from which results a kind of duty or superior necessity which pushes us naturally and rationally towards others. By virtue of evolution, our pleasures grow and become increasingly impersonal; we cannot experience enjoyment within our selves as if on a deserted isle. Our milieu, to which we better adapt ourselves every day, is human society, and we can no more be happy outside of this milieu than we can breathe outside the air. The purely selfish happiness of certain Epicureans is a chimera, an abstraction, an impossibility; the true human pleasures are all more or less social. Pure egoism, rather than being an affirmation of the self, is a mutilation of the self.