“If we knew what it was we were doing, it would not be called research, would it?”

“If I had known they were going to do this, I would have become a shoemaker.”

“Concerning matter, we have been all wrong. What we have called matter is energy, whose vibration has been so lowered as to be perceptible to the senses. There is no matter.”

“When we first got married, we made a pact. It was this: In our life together, it was decided I would make all of the big decisions and my wife would make all of the little decisions. For fifty years, we have held true to that agreement. I believe that is the reason for the success in our marriage. However, the strange thing is that in fifty years, there hasn’t been one big decision.”

“If I were not a Jew I would be a Quaker.”

“If tomorrow were never to come, it would not be worth living today.”

“Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.”