"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the ar…"

"The more I learn, the more I realize how much I don't know."

"I do not believe in a personal God and I have never denied this but have expressed it clearly. If something is in me which can be called religious then it is the unbounded admiration for the structure…"

"The difference between stupidity and genius is that genius has its limits."

"I have no special talents. I am only passionately curious."