I cannot imagine how the clockwork of the universe can exist without a clockmaker.

Now, you receive all your ideas; therefore you receive your wish, you wish therefore necessarily. The word "liberty" does not therefore belong in any way to your will....The will, therefore, is not a faculty that one can call free. A free will is an expression absolutely void of sense, and what the scholastics have called will of indifference, that is to say willing without cause, is a chimera unworthy of being combated.

We admit, in geometry, not only infinite magnitudes, that is to say, magnitudes greater than any assignable magnitude, but infinite magnitudes infinitely greater, the one than the other. This astonishes our dimension of brains, which is only about six inches long, five broad, and six in depth, in the largest heads.

A torch lighted in the forests of America set all Europe in conflagration.

History is the recital of facts represented as true. Fable, on the other hand, is the recital of facts represented as fiction.

A witty quote proves nothing.

When one man speaks to another man who doesn't understand him, and when a man who's speaking no longer understands, it's metaphysics.