"It is not possible to be a scientist unless you believe that it is good to learn. It is not possible to be a scientist unless you believe that it is of the highest value to learn."

"The optimist thinks this is the best of all possible worlds. The pessimist fears it is true."

"The atomic bomb is a weapon that has no limit to its destructive power. It is a weapon that can destroy cities, and it is a weapon that can destroy nations."

"In an important sense, the atomic bomb was made in Germany."

"We know too much for one man to know too much."