Your memory is a monster; you forget - it doesn't. It simply files things away. It keeps things for you, or hides things from you - and summons them to your recall with a will of its own. You think you have a memory; but it has you!
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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.