Africans had to be taught that nudity is wicked; this was done very cheaply by missionaries.

The solution of the difficulties which formerly surrounded the mathematical infinite is probably the greatest achievement of which our age has to boast.

The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it.

Thought is merciless to privilege, established institutions, and comfortable habit.

Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.

Why repeat the old errors, if there are so many new errors to commit?

A smile happens in a flash, but its memory can last a lifetime.