Gravity must be caused by some agent acting constantly according to certain laws; but whether this agent be material or immaterial, I have left to the consideration of my readers.
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"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."
"The cause of gravity is what I do not pretend to know."
"If I have seen further than others, it is by standing upon the shoulders of giants."
"The light which comes from the sun, and from all fire, consists of all the primary colours mixed together."
"I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses."
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