"People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion."

"Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence."

"Imagination is more important than knowledge."

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones."

"Laws alone can not secure freedom of expression; in order that every man present his views without penalty there must be spirit of tolerance in the entire population."

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

"Reality is merely an illusion, albeit a very persistent one."

"We can't solve problems by using the same kind of thinking we used when we created them."

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving and existing one.

Any man who can drive safely while kissing a pretty girl is simply not giving the kiss the attention it deserves.