Sir Isaac Newton was asked how he discovered the law of gravity. He replied, "By thinking about it all the time.
Isaac NewtonMy principal method for defeating error and heresy is by establishing the truth. One purposes to fill a bushel with tares, but if I can fill it first with wheat, I may defy his attempts.
Isaac NewtonPictures, propagated by motion along the fibers of the optic nerves in the brain, are the cause of vision.
Isaac NewtonAgainst filling the Heavens with fluid Mediums, unless they be exceeding rare, a great Objection arises from the regular and very lasting Motions of the Planets and Comets in all manner of Courses through the Heavens.
Isaac NewtonNow the smallest Particles of Matter may cohere by the strongest Attractions, and compose bigger Particles of weaker Virture.... There are therefore Agents in Nature able to make the Particles of Bodies stick together by very strong Attraction. And it is the Business of experimental Philosophy to find them out.
Isaac Newton