"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Ax: 100 Every thing doth naturally persevere in yt state in wch it is unlesse it bee interrupted by some externall cause, hence... [a] body once moved will always keepe ye same celerity, quantity & determination of its motion."
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Source: Sir Isaac Newton (1730). “Opticks:: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light”, p.324
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