Love has reasons which reason cannot understand.

All is one, all is different. How many natures exist in man? How many vocations? And by what chance does each man ordinarily choose what he has heard praised?

Too much and too little wine. Give him none, he cannot find truth; give him too much, the same.

All I know is that I must soon die, but what I know least is this very death which I cannot escape.

To deny, to believe, and to doubt well, are to a man what the race is to a horse.

If we must not act save on a certainty, we ought not to act on religion, for it is not certain. But how many things we do on an uncertainty, sea voyages, battles!

The arithmetical machine produces effects that approach nearer to thought than all the actions of animals. But it does nothing that would enable us to attribute will to it, as to the animals.