“The semiliterate on the next bar stool will tell you with absolute, arrogant assurance just how to solve the world's problems; while the scholar who has spent a lifetime studying their causes is not at all sure how to do this.”

— Edwin Thompson Jaynes

Probability Theory: The Logic of Science (2003)

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Edwin Thompson Jaynes 2

American physicist 1922–1998

Bill Watterson (1958) American comic artist

Source: Calvin and Hobbes: Sunday Pages 1985-1995: An Exhibition Catalogue

“What I cannot create, I do not understand.Know how to solve every problem that has been solved.”

Richard Feynman (1918–1988) American theoretical physicist

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

“What I cannot create, I do not understand.Know how to solve every problem that has been solved.”

Richard Feynman (1918–1988) American theoretical physicist

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

“Hate, it has caused a lot of problems in the world, but has not solved one yet.”

Maya Angelou (1928–2014) American author and poet

Nearly identical quote attributed to a 1995 TV show, Touched by an Angel https://www.imdb.com/title/tt0732136/quotes: Tess: No, hate has caused a lot of problems in this world, but it's never solved one yet.
Misattributed