“The feeling of self-assurance derived from physical achievement always transfers itself to the mental sphere.”
Beware of Pity (1939)
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Stefan Zweig 106
Austrian writer 1881–1942Related quotes

Source: Psyche and Matter (1992), p. 208

Quote of Escher, c. 1958; as cited in Biography of M.C. Escher http://im-possible.info/english/articles/escher/escher.html
1950's

Source: No Way Out (2002), Ch. 6: Seeking Strengthens Separation

“I feel my absolute best—physically, mentally and spiritually—when I'm surfing every day.”
[13 Questions With Marisa Miller, http://www.askmen.com/celebs/interview_200/233_marisa_miller_interview.html, AskMen.com, News Corporation, 2010-04-13]