“I once read that people who study others are wise but those who study themselves are enlightened".”
Source: The Monk Who Sold His Ferrari: A Fable About Fulfilling Your Dreams Reaching Your Destiny
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Robin S. Sharma 52
Canadian self help writer 1965Related quotes

Quoted by Bishop Jean-Pierre Camus in The Spirit of Saint Francis de Sales, ch. 1, Pg. 3 (1880)

Quote in Vincent's letter to brother Theo, from Arles, Sept. 1888; as quoted in Vincent van Gogh, edited by Alfred H. Barr; Museum of Modern Art, New York, 1935 https://www.moma.org/documents/moma_catalogue_1996_300061887.pdf, (letter 542), p. 39
1880s, 1888

“He who knows others is wise. He who knows himself is enlightened.”

Comedians in Cars Getting Coffee (2012 — Present), Season 3 (2014)
Nītiśataka 74; translated by B. Hale Wortham
Śatakatraya
“Science is the study of those things that can be reduced to the study of other things.”
Source: Introduction to General Systems Thinking, 1975, p. 30; Quote in: Dieter Spath, Walter Ganz (2008) The Future of Services: Trends and Perspectives. p. 226

Cited in: Justin Wintle (2002) Makers of Modern Culture. Vol. 1, p. 350
1970s, Blackberry Winter, 1972

Barry, John D. " Bible Study Anywhere http://www.biblestudymagazine.com", Bible Study Magazine, Mar-Apr 2009, pg. 14.