"The atomic bomb is a stark reminder that we are living in a new era, an era of unprecedented power and unprecedented danger."

"It is perfectly obvious that the whole world is going to hell. The only possible chance that it might not is that we do not attempt to prevent it from doing so."

"I need physics more than friends."

"In some sort of crude sense which no vulgarity, no humor, no overstatement can quite extinguish, the physicists have known sin."

"The atomic bomb is not a weapon to be used lightly."