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De Motu, Section Twenty-nine

25 September, 2015 - 15:16

Take away from the idea of body extension, solidity, and figure, and nothing will remain. But those qualities are indif- ferent to motion, nor do they contain anything which could be called the principle of motion. This is clear from our very ideas. If therefore by the term body be meant that which we conceive, obviously the principle of motion cannot be sought therein, that is, no part or attribute thereof is the true, efficient cause of the production of motion. But to employ a term, and conceive nothing by it is quite unworthy of a philosopher.