I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.

I do not know with what weapons World War 3 will be fought, but World War 4 will be fought with sticks and stones.

It is my conviction that killing under the cloak of war is nothing but an act of murder.

You cannot simultaneously prevent and prepare for war.

Peace cannot be kept by force; it can only be achieved by understanding.

The pioneers of a warless world are the young men (and women) who refuse military service.

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.