The relevance of diversity and variety to matters of explanation is one of the themes of another of Oresme’s works, On the Marvels of Nature. The general thesis is that marvels can be explained naturally: “The natural causes there assigned and the manner of finding them are possible and much more likely than that demons or unknown influences are the causes of the aforementioned effects.” There is simply too much credulity among people, Oresme thinks. “It seems to me that to believe easily is and has been the cause of the destruction of natural philosophy; and also in faith it makes and will
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