The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.

I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. Letter to Harry S. Truman.

Education is what remains after one has forgotten everything he learned in school.

Anyone who has never made a mistake has never tried anything new.

I came to America because of the great, great freedom which I heard existed in this country. I made a mistake in selecting America as a land of freedom, a mistake I cannot repair in the balance of my lifetime.

Peace cannot be kept by force. It can only be achieved by understanding.

It has become appallingly obvious that our technology has exceeded our humanity.

It's not that I'm so smart, it's just that I stay with problems longer.

What really interests me is whether God had any choice in the creation of the world. Remark to Ernst Straus, one of his assistants.

The idea of achieving security through national armament is, at the present state of military technique, a disastrous illusion.