"It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory, resulting in a very great theoretical development, are completely trivial from any point of view except their relevance to the structure of a theoretical system"
"We worked very hard to make the lyrics suit the music. I can't, like Elton John, for example, compose by lyrics. Elton has a great talent for that. Whatever you give him, including your questions, he composes in half an hour and makes a great song out of it"