I've met many thinkers and many cats, but the wisdom of cats is infinitely superior.

Four varieties in society: lovers, the ambitious, observers, and fools. The fools are the happiest.

History is nothing but a problem of mechanics applied to psychology.

We study ourselves three weeks, we love each other three months, we squabble three years, we tolerate each other thirty years, and then the children start all over again.

The search for causes must come after the collection of facts.

Amid this vast and overwhelming space and in these boundless solar archipelagoes, how small is our own sphere, and the earth, what a grain of sand!

I wish to reproduce things as they are or as they would be even if I myself did not exist.