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

"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it‘s longer than any hour. That‘s relativity. "

"A man‘s ethical behavior should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death. "

"Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid. "

"It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. 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 of the world so far as our science can reveal it. "

"I believe in Spinoza‘s God who reveals himself in the orderly harmony of what exists, not in a God who concerns himself with the fates and actions of human beings. "

"Do you really believe the moon is only there when you look at it? "