"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"An object that is at rest will tend to stay at rest. An object that is in motion will tend to stay in motion."
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Source: Isaac Newton (1979). “Opticks, Or, A Treatise of the Reflections, Refractions, Inflections & Colours of Light”, p.21, Courier Corporation
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