"Great spirits have always encountered violent opposition from mediocre minds."

"It is almost a miracle that modern teaching methods have not yet entirely strangled the holy curiosity of inquiry."

"Never do anything against conscience even if the state demands it."

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

"The real problem is in the hearts and minds of men. It is not a problem of physics but of ethics. It is easier to denature plutonium than to denature the evil from the spirit of man."

"The world is a dangerous place to live - not because of the people who are evil, but because of the people who don't do anything about it."

"There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

"We should take care not to make 'intellect' our god; it has, of course, powerful muscles, but no personality."