“… the person who is used to inquiry tries every possible pathway as he conducts his search and turns in every direction, and, so far from giving up the inquiry in the space of a day, does not cease his search throughout his life: directing his attention to one thing after another that is relevant to what is being investigated, he presses on until he attains his goal.”

Erasistratos of Ioulis, Paralysis book 21 12; trans. by G.E.R. Lloyd, Greek Science After Aristotle [1973] 86)]

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  1. (in Galen, Habits §1, CMG S.3 [1941