It is sometimes important for science to know how to forget the things she is surest of.

Think? Why think! We have computers to do that for us.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.

A few great minds are enough to endow humanity with monstrous power, but a few great hearts are not enough to make us worthy of using it.

In our ideals we unwittingly reveal our vices.

Never feel remorse for what you have thought about your wife; she has thought much worse things about you.

My pessimism extends to the point of even suspecting the sincerity of other pessimists.