“It is not the slumber of reason that engenders monsters, but vigilant and insomniac rationality.”
Source: Anti-Oedipus: Capitalism and Schizophrenia
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Gilles Deleuze 35
French philosopher 1925–1995Related quotes

“The sleep of reason produces monsters.”
1790s

the necessary and sufficient conditions for rational knowledge
Source: Great Islamic Encyclopedia website, 2016 https://www.cgie.org.ir/fa/news/154958

“Fantasy abandoned by reason produces impossible monsters”
1790s
Variant: The sleep of reason produces monsters.

quoted by Albert Frederick Calvert, in Goya; an account of his life and works; publisher London J. Lane, 1908; as quoted in Francisco Goya, Hugh Stokes, Herbert Jenkins Limited Publishers, London, 1914, pp. 355-377
Goya wrote this inscription upon a later copy of the etching-plate Capricho no. 43
1790s

“Rationalization may be defined as self-deception by reasoning.”
Our Inner Conflicts (1945) http://encarta.msn.com/quote_561555562/Reason_Rationalization_may_be_defined_as.html

Source: Reason: The Only Oracle Of Man (1784), Ch. IV Section I - Speculation on the Doctrine of the Depravity of Human Reason

“The point is that humans are rarely at their best when they use rational reasoning.”
Source: Why Stock Markets Crash - Critical Events in Complex Systems (2003), Chapter 4, Positive Feedbacks, p. 106.