"The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives."

"The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science. He to whom this emotion is a stranger, who can no longer pause to wonder and stand rapt …"

"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."

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

"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."