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Education Quote by Terry Pratchett

"They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance"

About this Quote

Pratchett flips a familiar proverb with the ease of a writer who’s spent a career exposing how “common sense” often functions as a social anesthetic. The old warning - that dabbling in knowledge makes people cocky and reckless - usually polices curiosity. It tells you: don’t touch the machinery unless you’re certified. Pratchett’s reversal aims at the real hazard: not the amateur with a book, but the confident void where understanding should be.

The line works because it’s structured like a pub-room correction, a casual “ah, but” that smuggles in a moral hierarchy. “A little knowledge” is framed as a manageable risk, even a forgivable one. “A lot of ignorance,” by contrast, isn’t innocent; it’s scalable. It accumulates, spreads, recruits. Ignorance can be worn as identity, defended as tradition, mistaken for virtue. And once it’s plentiful enough, it stops feeling like ignorance at all - it becomes worldview.

That subtext is classic Pratchett: the comedy is the crowbar. Across Discworld, he treats belief as a force with physics, capable of building gods, mobs, and bureaucracies out of nothing but conviction. In that universe, ignorance isn’t just absence; it’s an active ingredient in cruelty, panic, and policy.

The intent isn’t to romanticize half-informed hot takes. It’s to reassign the danger label to where it belongs: to the self-protecting certainty that refuses to learn, then demands the world conform to it.

Quote Details

TopicKnowledge
Source
Verified source: Equal Rites (Terry Pratchett, 1987)ISBN: 0575039507
Text match: 98.00%   Provider: Cross-Reference
Evidence:
They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance.. This line is widely attributed to a character (often identified as Granny Weatherwax) in Terry Pratchett’s Discworld novel Equal Rites. The earliest publication I could corroborate as a primary work is the UK first edition hardcover published 15 January 1987 by Victor Gollancz (in association with Colin Smythe). However, I could not reliably verify the exact page/chapter in the 1987 first edition from an accessible scan/preview; page numbers vary by edition/format. The quote also appears as publisher/marketing copy on later editions’ catalog pages, which is consistent with it being a notable line from the novel rather than originating in a speech/interview. Publication-date corroboration: Colin Smythe’s Discworld bibliographic page lists the first hardback publication date as 15 January 1987 and ISBN 0-575-03950-7; Wikipedia matches those details; OBNB has a catalog record tied to ISBN 0575039507 but lists 1986 (likely cataloging/prepublication data rather than the on-sale date).
Other candidates (1)
Science and Christianity (Tim Reddish, 2016) compilation95.0%
... They say a little knowledge is a dangerous thing , but it's not one half so bad as a lot of ignorance . -Terry Pr...
Cite

Citation Formats

APA Style (7th ed.)
Pratchett, Terry. (2026, February 17). They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance. FixQuotes. https://fixquotes.com/quotes/they-say-a-little-knowledge-is-a-dangerous-thing-12849/

Chicago Style
Pratchett, Terry. "They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance." FixQuotes. February 17, 2026. https://fixquotes.com/quotes/they-say-a-little-knowledge-is-a-dangerous-thing-12849/.

MLA Style (9th ed.)
"They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance." FixQuotes, 17 Feb. 2026, https://fixquotes.com/quotes/they-say-a-little-knowledge-is-a-dangerous-thing-12849/. Accessed 2 Apr. 2026.

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About the Author

Terry Pratchett

Terry Pratchett (April 28, 1948 - March 12, 2015) was a Author from United Kingdom.

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