I don't know what weapons will be used in the Third World War. But I can tell you what they'll use in the Fourth - rocks!

I am by heritage a Jew, by citizenship a Swiss, and by makeup a human being, and only a human being, without any special attachment to any state or national entity whatsoever.

It seems to me an utterly futile task to prescribe rules and limitations for the conduct of war. War is not a game; hence one cannot wage war by rules as one would in playing games. Our fight must be against war itself. The masses of people can most effectively fight the institution of war by establishing an organization for the absolute refusal of military service.

God is a scientist, not a magician.

If everybody lived as I do, surely the writing of romance novels would never have come into being.

Anybody who really wants to abolish war must resolutely declare himself in favor of his own country's resigning a portion of sovereignty in place of international institutions.

You cannot prevent and prepare for war at the same time.