“Mass psychology is not simply a summation of individual psychologies; that is a prime theorem of social psychodynamics—not just my opinion; no exception has ever been found to this theorem. It is the social mass-action rule, the mob-hysteria law, known and used by military, political, and religious leaders, by advertising men and prophets and propagandists, by rabble rousers and actors and gang leaders, for generations before it was formulated in mathematical symbols. It works.”

— Robert A. Heinlein , book Methuselah's Children

Methuselah’s Children (p. 535)
Short fiction, The Past Through Tomorrow (1967)

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Robert A. Heinlein 557

American science fiction author 1907–1988

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