Use and disuse

Definition and stakes

Portrait of Herbert Spencer Herbert Spencer,  Popular Science Monthly (1884)

“ Every theory of education, every discipline, from that of the arithmetician to that of the prize-fighter, every proposed reward for virtue or punishment for vice, implies the belief, embodied in sundry proverbs, that the use or disuse of each faculty, bodily or mental, is followed by an adaptive change in it—loss of power or gain of power according to demand. ”
Source: Wikisource

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