Richard Feynman — "Scientific knowledge is a body of statements of varying degrees of certainty—som…"
Scientific knowledge is a body of statements of varying degrees of certainty—some most unsure, some nearly sure, but none absolutely certain.
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More from Richard Feynman
"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 …"
"The fact that I can even ask the question, 'What is the mind?' means that the mind is a part of the universe."
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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 deal in absolute truths but in probabilities and confidence levels. Every scientific claim sits somewhere on a spectrum of certainty, supported by varying amounts of evidence. The most honest scientific stance acknowledges what we do not yet know. Certainty is a goal approached asymptotically, never fully reached, and pretending otherwise is intellectually dishonest.
Relevance to Richard Feynman
Feynman spent his career in quantum electrodynamics, a field built entirely on probabilistic predictions rather than deterministic certainties. He won the Nobel Prize for calculations of extraordinary precision yet always emphasized doubt as a scientific virtue. His Caltech lectures and public talks repeatedly championed intellectual humility, arguing that admitting uncertainty is a strength, not a weakness, distinguishing science from dogma.
The era
Feynman spoke during the Cold War, when science carried enormous authority and public trust following the Manhattan Project and space race. Political and ideological movements on both sides sought scientific certainty as propaganda. Against this backdrop, Feynman's insistence on probabilistic knowledge was a deliberate corrective, pushing back against both government overconfidence and pseudoscientific movements that mimicked science's authority while rejecting its uncertainty.
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