Walter Murch, editor, on the ambiguities of great films.
"...it's a wonderful dilemma: you have to acknowledge that there must be unsolved problems at each stage. As hard as you work, you must have this secret, unspoken hope that one very significant problem will remain unsolved. But you never know what that is until the film is done. You can almost define a film by the problem it poses, that it can't answer itself, that it then asks the audience to solve."
From the book The Conversations: Walter Murch and the Art of Editing Film