By such deductions the law of gravitation is rendered probable, that every particle attracts every other particle with a force which varies inversely as the square of the distance. The law thus suggested is assumed to be universally true.

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

I can calculate the motion of heavenly bodies, but not the madness of people.

Thus this Earth resembles a great animall or rather an inanimate vegetable, draws in aethereal breath for its dayly refreshment and vitall ferment and transpires again grosses exhalations. And, according to the condition of all other things living, ought to have its time of beginning, youth, old age and perishing.

Impressed force is the action exerted on a body to change its state either of resting or of moving uniformly straight forward.

When the adversaries of Erasmus had got the Trinity into his edition, they threw by their manuscript as an old almanac out of date.

Therefore to the same natural effects we must, as far as possible, assign the same causes.