"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Do not great Bodies conserve their heat the longest, their parts heating one another, and may not great dense and fix'd Bodies, when heated beyond a certain degree, emit Light so copiously, as by the Emission and Re-action of its Light, and the Reflexions and Refractions of its Rays within its Pores to grow still hotter, till it comes to a certain period of heat, such as is that of the Sun?"
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Source: Sir Isaac Newton (2016). “Delphi Collected Works of Sir Isaac Newton (Illustrated)”, p.1258, Delphi Classics
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