There is only one passion, the passion for happiness.
(Denis Diderot (1713-1784), French philosopher. repr. In Selected Writings, ed. Lester G. Crocker (1966). Elements of Physiology, "Will, Freedom," (notes written 1774-1780, originally published 1875-1877).)
(Ann Plato (1820-?), U.S. teacher and author. As quoted in Black Women in Nineteenth-Century American Life, part 2, by Bert James Loewenberg and Ruth Bogin (1976).
Plato, a free African American who was a schoolmistress in Hartford, Connecticut, said this in 1841.)
It is in the love of one's family only that heartfelt happiness is known.
(Thomas Jefferson (1743-1826), U.S. president. Letter, October 26, 1801, to his daughter, Mary Jefferson Eppes. The Family Letters of Thomas Jefferson, p. 211, eds. E.M. Betts and J.A. Bear, Jr. (1966).)
Boy, take my advice, and never try to invent any thing buthappiness.
(Herman Melville (1819-1891), U.S. author. "The Happy Failure" (1854), The Piazza Tales and Other Prose Pieces 1839-1860, The Writings of Herman Melville, vol. 9, eds. Harrison Hayford, Alma A. MacDougall, and G. Thomas Tanselle (1987).
Spoken by the failed inventor.)
There are as many kinds of beauty as there are habitual ways of seeking happiness.
(Charles Baudelaire (1821-1867), French poet. repr. In The Mirror of Art, ed. Jonathan Mayne (1955). "Salon of 1846," sct. 2, Curiosités Esthétiques (1868).
Baudelaire may have been recalling a footnote in ch. 110 of Stendhal's Histoire de la Peinture en Italie: "La beauté est l'expression d'une certaine manière habituelle de chercher le bonheur.")