"One day, when I was a student, I was reading a book on quantum mechanics, and I came across a sentence that said: 'The electron is a wave, and the electron is a particle.' I was very confused, because…"

"The only way to do great work is to love what you do."

"I consider myself a lucky man who did not have to choose between going to war and doing something else. I just did what I was doing."

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

"I have been very lucky in my life. I have always been able to do what I wanted to do, and I have always been able to do it with people I liked."