“The history of Western science confirms the aphorism that the great menace to progress is not ignorance but the illusion of knowledge.”
This "aphorism" was expressed in different forms by Josh Billings and Socrates. note: Often misquoted as, "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge," and often misattributed to Stephen Hawking.
Source: Cleopatra's Nose: Essays on the Unexpected (1995).
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Daniel J. Boorstin 39
American historian 1914–2004Related quotes

“The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.”

“The greatest enemy of knowledge is not ignorance. It is the illusion of knowledge.”
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)
Misattributed

“The greatest obstacle to discovery is not ignorance - it is the illusion of knowledge.”

Remarks to David Lloyd George (4 September 1936), quoted in Thomas Jones, A Diary with Letters. 1931-1950 (Oxford University Press, 1954), p. 245
1930s

Source: Reforming Education: The Opening of the American Mind (1990), p. 316