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.