“If you can solve your problem, then what is the need of worrying?
If you cannot solve it, then what is the use of worrying?”
Attributed
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Šantidéva 41
8th-century Indian Buddhist monk and scholar 685–763Related quotes

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

“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

Interview with World Policy http://www.worldpolicy.org/blog/2016/04/21/interview-thaksin-shinawatra-thailand

“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

Source: Enigmas Of Chance (1985), Chapter 6, Cornell II, p. 122.

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]