"The development of atomic weapons has made it clear that there is no alternative to international cooperation."

"We have to find a way to reconcile our scientific progress with our moral responsibility."

"If atomic bombs are to be added as new weapons to the arsenals of a warring world, or to the arsenals of nations preparing for war, then the time will come when mankind will curse the names of Los Ala…"

"The experience of one's own country and of other countries, the experience of men and women, of cities and of the earth, is an experience which can only be had in freedom."

"We have to find a way to use this power for good, not for evil."