"Every kind of peaceful cooperation among men is primarily based on mutual trust and only secondarily on institutions such as courts of justice and police."

"Nothing will benefit human health and increase the chances for survival of life on Earth as much as the evolution to a vegetarian diet."

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."

"Gravitation cannot be held responsible for people falling in love."

"I have deep faith that the principle of the universe will be beautiful and simple."

"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most People are even incapable of forming such opinions."

"It is well that war is so terrible - otherwise we would grow too fond of it."

"You can't say that civilization don't advance, however, for in every war they kill you in a new way."

"I think the mark of a great ruler, is not his ability to make war but to achieve peace."

"The way to win an atomic war is to make certain it never starts."

"Neither enemy faces, nor the mothers that love them, come to mind when one is thinking of nothing but endeavouring to survive. Philosophising about war is useless under fire."

"One day President Roosevelt told me that he was asking publicly for suggestions about what the war should be called. I said at once 'The Unnecessary War'."