"If you want to live a happy life, tie it to a goal, not to people or things."

"The Jews are a community bound together by ties of blood and tradition, not of religion only."

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

"I have reached an age when if someone tells me to wear socks, I don't have to."

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."