"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"What Descartes did was a good step. You have added much several ways, and especially in taking the colours of thin plates into philosophical consideration. If I have seen a little further it is by standing on the shoulders of Giants."
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Source: Isaac Newton (1966). “Sir Isaac Newton's Mathematical Principles of Natural Philosophy and His System of the World: The motion of bodies”, p.17, Univ of California Press
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