I've made movies that were adaptations and I've been kind of frustrated by the process because, you know that old axiom, 'It's never as good as the book'? It's often true because nothing competes with your own imagination. When you're reading a book and you imagine something in your head, nothing's going to compete with that.
Constant work, constant writing and constant revision. The real writer learns nothing from life. He is more like an oyster or a sponge. What he takes in he takes in normally the way any person takes in experience. But it is what is done with it in his mind, if he is a real writer, that makes his art.