"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"I have presented principles of philosophy that are not, however, philosophical but strictly mathematical-that is, those on which the study of philosophy can be based. These principles are the laws and conditions of motions and of forces, which especially relate to philosophy."
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Source: Isaac Newton, I. Bernard Cohen, Anne Whitman (1999). “The Principia: Mathematical Principles of Natural Philosophy”, p.793, Univ of California Press
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