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We must explain then first why nature belongs to the class of causes which act for the sake of something; and then about the necessary and its place in nature, for all writers ascribe things to this cause, arguing that since the hot and the cold and the like are of such and such a kind, therefore certain things necessarily are and come to be – and if they mention any other cause (one friendship and strife, another mind), it is only to touch on it, and then good-bye to it.1

Empedocles and the Other Physiologists in Aristotle’s Physics II 8