I rather like this quote, which I found on this page:

“Don’t ask me to explain too much! The only valid thing in art is that which cannot be explained…Believe me, there are certain mysteries, certain secrets in my work which even I don’t understand nor do I try to do so….Mysteries have to be respected if they are to retain their power.” -George Braque (The Penguin Book of Art Writing, p. 312.)