“People will always prefer black-and-white over shades of grey, and so there will always be the temptation to hold overly-simplified beliefs and to hold them with excessive confidence”
Source: How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life
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Thomas Gilovich 2
American psychologist 1954Related quotes
“The world isn't black and white, Annie, it's shades of grey.”
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London Observer (January 2, 1983)

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Autobiographical sketch at the official Nobel Prize site
Nobel autobiography (1975)