It's a passion when you're doing it for other people and you're doing it for the people around you making the film and the people who are going to see the film, and the giving. When you start thinking about you doing it for some sort of self-gain, then I think it becomes an obsession. It becomes a negative experience.

Shooting a movie is the worst milieu for creative work ever devised by man.

I will say that the God concept is at the heart of 2001 but not any traditional, anthromorphic image of God. I don't believe in any of Earth's monotheistic religions, but I do believe that one can construct an intriguing scientific definition of God, once you accept the fact that there are approximately 100 billion stars in our galaxy alone, that each star is a life-giving sun and that there are approximately 100 billion galaxies in just the visible universe.

If you can talk brilliantly about a problem, it can create the consoling illusion that it has been mastered.

I think the big mistake in schools is trying to teach children anything, and by using fear as the basic motivation. Fear of getting failing grades, fear of not staying with your class, etc. Interest can produce learning on a scale compared to fear as a nuclear explosion to a firecracker.

Never say no to an idea - you never know how that idea will ignite another idea.

If you can talk brilliantly about a problem