“If the problem can be solved why worry? If the problem cannot be solved worrying will do you no good.”
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Šantidéva 41
8th-century Indian Buddhist monk and scholar 685–763Related quotes

“If you cannot solve the proposed problem, try to solve first a simpler related problem.”
Mathematical Methods in Science (1977), p.164
Source: Codependent No More: How to Stop Controlling Others and Start Caring for Yourself

Stopped in Our Tracks, Book Two: Excerpts from U.G.'s Dialogues (2005) by K. Chandrasekhar

Source: Interview with Shigeru Miyamoto http://www.eurogamer.net/articles/shigeru-miyamoto-interview Eurogamer.net, published on 31 March 2010

as quoted by Sandhya Ramesh in: [Interview: 'There's No Conflict Between Lack of Evidence of String Theory and Work Being Done on It', The Wire, Bengaluru, 7 January 2018, https://thewire.in/science/theres-no-conflict-lack-evidence-string-theory-work-done]
“We cannot solve life's problems except by solving them.”
Source: The Road Less Traveled: A New Psychology of Love, Traditional Values, and Spiritual Growth

“If a problem cannot be solved, enlarge it.”
As quoted in Baseball's Greatest Quotes (1992) by Paul Dickson; cited in "Game Day in the Majors" at the Library of Congress http://memory.loc.gov/ammem/collections/robinson/jrgmday.html

“What I cannot create, I do not understand.Know how to solve every problem that has been solved.”
on his blackboard at the time of death in February 1988; from a photo in the Caltech archives http://archives.caltech.edu/pictures/1.10-29.jpg