"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"The description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn."
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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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