"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Do not the Rays of Light which fall upon Bodies, and are reflected or refracted, begin to bend before they arrive at the Bodies; and are they not reflected, refracted, and inflected, by one and the same Principle, acting variously in various Circumstances?"
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Source: Sir Isaac Newton (2016). “Opticks: A Treatise of the Reflections, Refractions, Inflections, and Colours of Light”, p.210, Library of Alexandria
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