I Feign No Hypotheses.

Gravity Explains The Motions Of The Planets, But It Cannot Explain Who Sets The Planets In Motion.

To Any Action There Is Always An Opposite And Equal Reaction; In Other Words, The Actions Of Two Bodies Upon Each Other Are Always Equal And Always Opposite In Direction.

I Can Calculate The Motion Of Heavenly Bodies, But Not The Madness Of People.

Our Design, Not Respecting Arts, But Philosophy, And Our Subject, Not Manual, But Natural Powers, We Consider Chiefly Those Things Which Relate To Gravity, Levity, Elastic Force, The Resistance Of Fluids, And The Like Forces, Whether Attractive Or Impulsive; And Therefore We Offer This Work As Mathematical Principles Of Philosophy; For All The Difficulty Of Philosophy Seems To Consist In This From The Phenomena Of Motions To Investigate The Forces Of Nature, And Then From These Forces To Demonstrate The Other Phenomena.

Hypotheses Non Fingo. I Frame No Hypotheses.