“The only thing more dangerous than an idea is a belief.”
Source: The Wordy Shipmates
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Sarah Vowell 35
American author, journalist, essayist and social commentator 1969Related quotes

“Nothing is more dangerous than an idea, when you have only one idea.”
Propos sur le Religion no. 74 (1938), under the pen name Alain.
Alternate translation: “Nothing is more dangerous than an idea, when it's the only one we have.” IZQuotes https://izquotes.com/quote/%C3%A9mile-chartier/nothing-is-more-dangerous-than-an-idea-when-you-have-only-one-idea-390165 (retrieved 10/30/18).

“There’s nothing more dangerous than a good idea.”
Ron English's Fauxlosophy (2016)

Daniel T. Gilbert (2007) in: John Brockman. What is your dangerous idea?: today's leading thinkers on the unthinkable. Harper Perennial, 2007, p. 42

“There are few things more dangerous than inbred religious certainty.”
Source: God's Problem: How the Bible Fails to Answer Our Most Important Question - Why We Suffer

“The one thing that is more dangerous than true ignorance is the illusion of understanding.”
Source: Life, Sex, and Ideas: The Good Life Without God (2002), Chapter 57, “Becoming Philosophical” (p. 226)