“The conservative has but little to fear from the man whose reason is the servant of his passions, but let him beware of him in whom reason has become the greatest and most terrible of the passions. These are the wreckers of outworn empires and civilisations, doubters, disintegrators, deiciders.”

— J. B. S. Haldane

Daedalus or Science and the Future (1923)
Variant: The conservative has little to fear from the man whose reason is the servant of his passions, but let him beware of him in whom reason has become the greatest and most terrible of passions. These are the wreckers of outworn empires.

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J. B. S. Haldane32

Geneticist and evolutionary biologist 1892–1964

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