"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"From what has been said it is also evident, that the Whiteness of the Sun's Light is compounded all the Colours wherewith the several sorts of Rays whereof that Light consists, when by their several Refrangibilities they are separated from one another, do tinge Paper or any other white Body whereon they fall. For those Colours ... are unchangeable, and whenever all those Rays with those their Colours are mix'd again, they reproduce the same white Light as before."
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Source: Sir Isaac Newton (2016). “Opticks: A Treatise of the Reflections, Refractions, Inflections, and Colours of Light”, p.98, Library of Alexandria
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