When Two Forces Unite, Their Efficiency Double.

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.

My Design In This Book Is Not To Explain The Properties Of Light By Hypotheses, But To Propose And Prove Them By Reason And Experiments: In Order To Which, I Shall Premise The Following Definitions And Axioms.

Definition Of Inertia: 'the Vis Insita, Or Innate Force Of Matter, Is A Power Of Resisting By Which Every Body, As Much As In It Lies, Endeavours To Preserve Its Present State, Whether It Be Of Rest Or Of Moving Uniformly Forward In A Straight Line.

I Do Not Know What I May Appear To The World, But To Myself I Seem To Have Been Only Like A Boy Playing On The Seashore, And Diverting Myself In Now And Then Finding A Smoother Pebble Or A Prettier Shell Than Ordinary, Whilst The Great Ocean Of Truth Lay All Undiscovered Before Me.

In The Absence Of Any Other Proof, The Thumb Alone Would Convince Me Of God's Existence.