Assertion: body's motion | /r/HasProperty | de caelo
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text: Note, however, that even if we endorsed the exhaustiveness of the dichotomy of natural and forced motions, and accepted the thesis that simple bodies possess a unique natural motion (De caelo 1.2, 269a8–9), we would not need thereby to accept Aristotle’s further major claim, that natural and forced motions come in pairs of opposites, with the result that if a motion is contrary to the nature of an entity, the opposite motion will be its natural motion (De caelo 1.2, 269a9–18).