"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"One [method] is by a Watch to keep time exactly. But, by reason of the motion of the Ship, the Variation of Heat and Cold, Wet and Dry, and the Difference of Gravity in different Latitudes, such a watch hath not yet been made."
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Source: David Brewster, Isaac Newton (1855). “Memoirs of the Life, Writings and Discoveries of Sir Isaac Newton”, p.260
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