"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Our present work sets forth mathematical principles of philosophy. For the basic problem of philosophy seems to be to discover the forces of nature from the phenomena of motions and then to demonstrate the other phenomena from these forces. It is to these ends that the general propositions in books 1 and 2 are directed, while in book 3 our explanation of the system of the world illustrates these propositions."
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Source: Sir Isaac Newton (2014). “Newton: Philosophical Writings”, p.60, Cambridge University Press
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