“Acting in conformity with reason, in the singular, and acting for good reasons, in the plural, are two different things insofar as reason is objective, whereas reasons are subjective. From an external point of view, we can evaluate a policy as being in conformity with reason or not. From an internal point of view, one can evaluate an action as being rational or not. From this difference it follows that only rationality can be used for explanatory ends. It is only insofar as the agent has made the demands of reason his own that the latter may give rise to, and possibly explain, specific behaviors. The assessment of the actor and that of the observer need not coincide.”
Reason and Rationality (2009)
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Jon Elster 12
Norwegian academic 1940Related quotes

“To a rational being it is the same thing to act according to nature and according to reason.”
VII, 11
Meditations (c. 121–180 AD), Book VII

"entente libre", Fr
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An Old Chaos: Humanism and Flying Saucers (p. 75)
The Silence of Animals: On Progress and Other Modern Myths (2013)

Paul Bernays, Platonism in mathematics http://sites.google.com/site/ancientaroma2/book_platonism.pdf (1935)

“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.

No, only the religious mind could even think that.
Patheos, Correspondence with a Creationist http://www.patheos.com/blogs/reasonadvocates/2017/06/06/correspondence-with-a-creationist/ (June 6, 2017)