"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"It is indeed a matter of great difficulty to discover, and effectually to distinguish, the true motions of particular bodies from the apparent; because the parts of that immovable space, in which those motions are performed, do by no means come under the observation of our senses. Yet the thing is not altogether desperate; for we have some arguments to guide us, partly from the apparent motions, which are the differences of the true motions; partly from the forces, which are the causes and effects of the true motions."
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Source: Sir Isaac Newton (2016). “Delphi Collected Works of Sir Isaac Newton (Illustrated)”, p.470, Delphi Classics
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