The intellectually aggressive hedgehogs knew one big thing and sought, under the banner of parsimony, to expand the explanatory power of that big thing to “cover” new cases; the more eclectic foxes knew many little things and were content to improvise ad hoc solutions to keep pace with a rapidly changing world.
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Notes from Wikiquote
About prediction and forecasting. Fox commented that "psychologist Philip Tetlock (following the lead of Isaiah Berlin), divided the world of political forecasters into hedgehogs and foxes."