"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Are not all Hypotheses erroneous, in which Light is supposed to consist in Pression or Motion, propagated through a fluid Medium? For in all these Hypotheses the Phaenomena of Light have been hitherto explain'd by supposing that they arise from new Modifications of the Rays; which is an erroneous Supposition."
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Source: Isaac Newton (2007). “Opticks: Or a Treatise of the Reflections, Refractions, Inflections and Colours of Light”, p.362, Cosimo, Inc.
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