You know, people think you have to be dumb to skip rope for 45 minutes. No, you have to be able to imagine something else. While you're skipping rope, you have to be able to see something else.
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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.