"I am not an optimist. I am a realist. I believe that we must be prepared for the worst, and hope for the best."

"Young man, I am not trying to shake your faith in God, but in the physicists."

"The atomic age will either usher in a new era of prosperity, or it will be the end of civilization."

"The best way to predict the future is to create it."

"We must never forget the lessons of history, and we must always strive to build a better future."