"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Definition of inertia: 'The vis insita, or innate force of matter, is a power of resisting by which every body, as much as in it lies, endeavours to preserve its present state, whether it be of rest or of moving uniformly forward in a straight line."
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Source: Sir Isaac Newton (2012). “Newton's Philosophy of Nature: Selections from His Writings”, p.65, Courier Corporation
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