"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Is not Fire a Body heated so hot as to emit Light copiously? For what else is a red hot Iron than Fire? And what else is a burning Coal than red hot Wood?"
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Source: Sir Isaac Newton (1718). “Opticks: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light. ...”, p.316
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