Source: 1960 - 1970, Interview with David Sylvester 2. Spring 1965, p. 259
“I think metaphysics is good if it improves everyday life; otherwise forget it.”
Source: Zen and the Art of Motorcycle Maintenance (1974), Ch. 20
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Robert M. Pirsig 164
American writer and philosopher 1928–2017Related quotes

“Kaizen is everyday improvement, everybody improvement, everywhere improvement.”

Source: The Paris Review interview (1981), p. 338

AI Podcast, December 30, 2019, Algorithms, Complexity, Life, and The Art of Computer Programming https://www.youtube.com/watch?v=2BdBfsXbST8,

“Life must be rich and full of loving--it's no good otherwise, no good at all, for anyone.”
Source: Selected Letters, 1940-1956

International Herald Tribune (Paris, October 2, 1989) The Columbia World of Quotations, 1996. http://www.bartleby.com/66/78/4378.html
“Life, a good life, a great life is about "Why not?" May we never forget it.”
Source: Happy Birthday