The first causes of motion do not exist in matter; bodies receive from and communicate motion to each other, but they cannot originally produce it. The more I observe the action and reaction of the powers of nature acting on each other, the more I am convinced that they are merely effects; and we must ever recur to some volition as the first cause: for to suppose there is a progression of causes to infinity, is to suppose there is no first cause at all. In a word, every motion that is not produced by some other, must be the effect of spontaneous, voluntary act. Inanimate bodies have no
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