"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"The Synthesis consists in assuming the Causes discovered and established as Principles, and by them explaining the Phænomena proceeding from them, and proving the Explanations."
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Source: Sir Isaac Newton (1730). “Opticks:: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light”, p.380
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