Let us admit the case of the conservative. If we once start thinking, no one can guarantee what will be the outcome, except that many objects, ends, and institutions will be surely doomed. Every thinker puts some portion of an apparently stable world in peril, and no one can wholly predict what will emerge in its place.
John Dewey (1859-1952) American teacher and philosopher
Experience and Nature, ch. 6 “Nature, Mind and the Subject” (1929)
(Source)
Book form of the inaugural Paul Carus lectures, given by Dewey in 1925.
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Hadst thou not Greek enough to understand thus much: The end of Man is an Action and not a Thought, though it were the noblest.
Thomas Carlyle (1795-1881) Scottish essayist and historian
Sartor Resartus, Book 2, ch. 6 (1831)
(Source)
From Aristotle, Nicomachean Ethics, 1.3.6 ("The end aimed at is not knowledge but action").