Just as there are polysyllabic words that say very little, so there are also monosyllabic words of infinite meaning.

They do not think, therefore they are not.

The great trick of regarding small departures from the truth as the truth itself - on which is founded the entire integral calculus - is also the basis of our witty speculations, where the whole thing would often collapse if we considered the departures with philosophical rigour.

Nothing reveals a man's character better than the kind of joke at which he takes offense.

I have remarked very clearly that I am often of one opinion when I am lying down and of another when I am standing up.

We are obliged to regard many of our original minds as crazy at least until we have become as clever as they are.

What is the good of drawing conclusions from experience? I don't deny we sometimes draw the right conclusions, but don't we just as often draw the wrong ones?