No Sciences Are Better Attested Than The

For The Rays, To Speak Properly, Have No Colour. In Them There Is Nothing Else Than A Certain Power And Disposition To Stir Up A Sensation Of This Colour Or That.

Every Action Has An Equal And Opposite Reaction

I Am Ashamed To Tell You To How Many Figures I Carried These Calculations [of Pi], Having No Other Business At The Time

...from The Same Principles, I Now Demonstrate The Frame Of The System Of The World.

Our Present Work Sets Forth Mathematical Principles Of Philosophy. For The Basic Problem Of Philosophy Seems To Be To Discover The Forces Of Nature From The Phenomena Of Motions And Then To Demonstrate The Other Phenomena From These Forces. It Is To These Ends That The General Propositions In Books 1 And 2 Are Directed, While In Book 3 Our Explanation Of The System Of The World Illustrates These Propositions.