The great nations have always acted like gangsters, and the small nations like prostitutes.

How could we possibly appreciate the Mona Lisa if Leonardo had written at the bottom of the canvas: 'The lady is smiling because she is hiding a secret from her lover.' This would shackle the viewer to reality, and I don't want this to happen to 2001.

Nothing is as dangerous as a sure thing.

It's impossible to tell you what I'm going to do except to say that I expect to make the best movie ever made.

Sanitised violence in movies has been accepted for years. What seems to upset everybody now is the showing of the consequences of violence.

I’ve never been certain whether the moral of the Icarus story should only be, as is generally accepted, ‘don’t try to fly too high,’ or whether it might also be thought of as ‘forget the wax and feathers, and do a better job on the wings.

I haven't come across any recent new ideas in film that strike me as being particularly important and that have to do with form. I think that a preoccupation with originality of form is more or less a fruitless thing. A truly original person with a truly original mind will not be able to function in the old form and will simply do something different. Others had much better think of the form as being some sort of classical tradition and try to work within it.