"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis, and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy."
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Source: Letter to Robert Hooke, 5 Feb. 1676
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