The concept of number is the obvious distinction between the beast and man.

I do not know what the heart of a rascal may be, but I know what is in the heart of an honest man; it is horrible.

Genius does not seem to derive any great support from syllogisms. Its carriage is free; its manner has a touch of inspiration. We see it come, but we never see it walk.

Man's destructive hand spares nothing that lives; he kills to feed himself, he kills to clothe himself, he kills to adorn himself, he kills to attack, he kills to defend himself, he kills to instruct himself, he kills to amuse himself, he kills for the sake of killing.

There is no man who desires as passionately as a Russian. If we could imprison a Russian desire beneath a fortress, that fortress would explode.

To know how to wait. It is the great secret of success.

If there was no moral evil upon earth, there would be no physical evil.