I hate doubt, yet I am certain that doubt is the only way to approach — Edward Teller

"Before Bethe married, he was so often a guest in the Teller home that he became almost one of the family. In April, 1954, that was all over. There could be no real reconciliation. Bethe had lost one of his oldest friends. But Teller had lost more. Teller, by lending his voice to the cause of Oppenheimers enemies, had lost not only the friendship but the respect of many of his colleagues, and he was portrayed by newspaper writers and cartoonists as a Judas, a man who had betrayed his leader for the sake of personal gain."

"I believe in good. It is an ephemeral and elusive quality. It is the center of my beliefs, but it cannot be strengthened by talking about it."

"The preservation of peace and the improvement of the lot of all people require us to have faith in the rationality of humans. If we have this faith and if we pursue understanding, we have not the promise but at least the possibility of success. We should not be misled by promises. Humanity in all its history has repeatedly escaped disaster by a hairs breadth. Total security has never been available to anyone. To expect it is unrealistic; to imagine that it can exist is to invite disaster. What we do have in our technological capacities is an opportunity to use our inventiveness, our creativity, our wisdom and our understanding of our fellow beings to create a future world that is a little better than the one in which we live today."

"At the end of the war, most people wanted to stop. I didnt. Because here was more knowledge. And in the coming uncertain period, with a dangerous man like Stalin around, and our incomplete knowledge, I felt that more knowledge is necessary. Among the people who knew a great deal about the hydrogen bomb, I was the only advocate of it. And that is, I think, my contribution. Not that I invented it, others would have — and others in the Soviet Union did. But I was the one person who put knowledge, and the availability of knowledge, above everything else."

"A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective."

"By having simplified what is known, physicists have been led into realms which as yet are anything but simple. That at some time, they, too, will appear as simple consequences of a theory of which no one has yet dreamed is not a statement of fact. It is a statement of faith."