Richard Feynman — "If you thought that science was certain — well, that is just an error on your pa…"
If you thought that science was certain — well, that is just an error on your part.
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More from Richard Feynman
"I don't know anything, but I know that I know nothing. And that's the beginning of wisdom."
"I don't believe in anything, but I have a lot of fun."
"I asked him once, 'How do you tell when a mathematical argument is correct?' He said, 'If it's beautiful, it's correct.'"
"If you want to master something, teach it."
"I got a dollar for my patent! I give it to everybody. Result: everybody who has one of these patent because it was easy a lot of people had been sending things in lots of patents. Everybody come down …"
About Richard Feynman (1918-1988)
American theoretical physicist who shared the 1965 Nobel for QED, developed Feynman diagrams, and wrote the Feynman Lectures on Physics. Closely associated with Julian Schwinger (co-Nobelist for QED) and Murray Gell-Mann (Caltech rival and Eightfold-Way physicist). For an intellectual contrast, see Deepak Chopra, physician and quantum-mysticism author — Feynman's Caltech 'cargo cult science' commencement address is the precise template for what he saw as misuse of physics terminology — Chopra-style appropriation of quantum vocabulary for metaphysical claims is the canonical example of what Feynman called 'fooling yourself'.
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Understanding this quote
What it means
Science does not deliver absolute certainty — it delivers the best current explanation based on evidence, always open to revision. Thinking otherwise mistakes the nature of scientific knowledge entirely. Science thrives on doubt, not dogma. Its power comes precisely from willingness to be wrong, to test, to revise. Certainty is the enemy of inquiry, and inquiry is the whole point.
Relevance to Richard Feynman
Feynman built his career on probing the deepest uncertainties in physics — quantum electrodynamics deals with probabilities, not certainties, at the subatomic level. He famously celebrated not knowing as intellectually honest and productive. His Caltech lectures and public talks consistently attacked false certainty in science education. He believed pretending to know what you don't is the most dangerous intellectual sin a scientist can commit.
The era
Feynman worked through the Cold War era when science carried enormous public prestige — nuclear power, space race, medical breakthroughs created a cultural myth of science as omniscient authority. Governments and institutions often presented scientific conclusions as settled fact to justify policy. Feynman pushed back against this, insisting scientific literacy meant embracing uncertainty rather than treating experts as infallible oracles delivering absolute truth.
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