"The world is not to be understood by reason alone. It is also to be understood by intuition and feeling."

"The atom consists of a nucleus and electrons. This is a very crude picture, but it is the one we have to work with."

"We are part of the world, and the world is part of us."

"I don't like it, and I'm sorry I ever had anything to do with it."

"The number of children born to a marriage ought to be limited, and that a man who has already had some children should be sterilized."