"The problem is not to get students to ask questions, but to get them to ask interesting questions."

"The only way to tell if a person is honest is to observe their behavior."

"I did not attack 'free will.' I attacked a traditional concept of 'free will' which is no longer tenable."

"Man is a machine in the sense that he is a complex system behaving in lawful ways."

"We are all controlled by the world, part of the time in rather crude ways, and part of the time very subtly."