“Stupidity mistook itself for intelligence, whereas intelligence knew its own stupidity.”
Source: Purity
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Jonathan Franzen 50
novelist 1959Related quotes

Source: Derb Quotes https://www.nationalreview.com/corner/derb-quotes-john-derbyshire/, National Review, November 20, 2003.

“Military intelligence was as nothing to military stupidity.”
Source: Vorkosigan Saga, Diplomatic Immunity (2002), Chapter 2 (p. 32)
“There are only two races on this planet — the intelligent and the stupid.”
As quoted in Daily Telegraph (15 August 1991)

Freeman (1948), p. 155

On José Mourinho, (November 2005) http://news.bbc.co.uk/sport2/hi/football/teams/a/arsenal/4398238.stm
Context: He's out of order, disconnected with reality and disrespectful. When you give success to stupid people, it makes them more stupid sometimes and not more intelligent.

“I would prefer an intelligent hell to a stupid paradise.”

“Intelligent men are cruel. Stupid men are monstrously cruel.”
The Star Rover
Variant: Intelligent men are cruel. Stupid men are monstrously cruel