"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Do not Bodies and Light act mutually upon one another; that is to say, Bodies upon Light in emitting, reflecting, refracting and inflecting it, and Light upon Bodies for heating them, and putting their parts into a vibrating motion wherein heat consists?"
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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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