I don't begin a novel or a screenplay until I know the ending. And I don't mean only that I have to know what happens. I mean that I have to hear the actual sentences. I have to know what atmosphere the words convey.
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I believe you have constructive accidents en route through a novel only because you have mapped a clear way. If you have confidence that you have a clear direction to take, you always have confidence to explore other ways; if they prove to be mere digressions, you'll recognize that and make the necessary revisions.