The greatest enemy of knowledge is not ignorance. It is the illusion of knowledge.

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Source, in full

Sometimes attributed to Hawking without a source, but originally from historian Daniel J. Boorstin. It appears in different forms in The Discoverers (1983), Cleopatra's Nose (1995), and introduction to The Decline and Fall of the Roman Empire (1995)

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Quote text and notes from Wikiquote: Stephen Hawking (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.