Despite the popularity of the accidentalist theory in the early medieval period and the weight of authority that supported it, Gilbert had good reasons to be skeptical. Just to restate the basic idea, the accidentalist realizes that nothing can be individuated by essential features, since these are shared by all other members of the same species. Groucho is rational, but so are Harpo, my brother, and every other human that ever has existed or will exist. Instead, we should look to accidental features. Groucho has accidents also found in other humans, but it could never happen that some other
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