"A hallucination is a fact, not an error; what is erroneous is a judgment based upon it"
About this Quote
The subtext is Russell’s broader campaign against sloppy metaphysics and overconfident certainty. Early 20th-century philosophy was busy disentangling sense-data, perception, and the external world, and Russell is pushing a discipline of epistemic hygiene: separate occurrence from inference. It’s also an implicit defense of people whose experiences don’t conform to consensus reality. He refuses the easy move of calling them “wrong” at the level of experience; he reserves criticism for the interpretive leap.
The intent feels almost political in a quiet way. If you can learn to say “I had an experience” without immediately saying “therefore the world is X,” you become harder to manipulate by propaganda, panic, and group delusion. Russell isn’t romanticizing hallucination; he’s democratizing doubt. The mind will produce impressions. The adult task is to judge them without turning every vivid feeling into a verdict about reality.
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APA Style (7th ed.)
Russell, Bertrand. (2026, January 15). A hallucination is a fact, not an error; what is erroneous is a judgment based upon it. FixQuotes. https://fixquotes.com/quotes/a-hallucination-is-a-fact-not-an-error-what-is-30106/
Chicago Style
Russell, Bertrand. "A hallucination is a fact, not an error; what is erroneous is a judgment based upon it." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/a-hallucination-is-a-fact-not-an-error-what-is-30106/.
MLA Style (9th ed.)
"A hallucination is a fact, not an error; what is erroneous is a judgment based upon it." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/a-hallucination-is-a-fact-not-an-error-what-is-30106/. Accessed 4 Mar. 2026.











