If, as I suggested before, the ability to tell right from wrong should turn out to have anything to do with the ability to think, then we must be able to “demand” its exercise from every sane person, no matter how erudite or ignorant, intelligent or stupid, he may happen to be.

Hannah Arendt (1906-1975) German-American philosopher, political theorist

Life of the Mind, Vol. 1 “Thinking,” Introduction (1977)
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Originally published as an essay (1977-11-14), "Thinking -- I," The New Yorker (1977-11-21).