The wonderful arrangement and harmony of the cosmos would only originate in the plan of an almighty omniscient being. This is and remains my greatest comprehension.

He who thinks half-heartedly will not believe in God; but he who really thinks has to believe in God.

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.

I see I have made my self a slave to Philosophy.

I can measure the motion of bodies but I cannot measure human folly.

Is not Fire a Body heated so hot as to emit Light copiously? For what else is a red hot Iron than Fire? And what else is a burning Coal than red hot Wood?

Physics, beware of metaphysics.