"If you were a medieval scholar reading a book, you knew that there was a reasonable likelihood you'd never see that particular text again, and so a high premium was placed on remembering what you read. You couldn't just pull a book off the shelf to consult it for a quote or an idea."

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Preparation is not only about managing external risks, but about limiting the likelihood that you'll unwittingly add to them. When you're the author of your own fate, you don't want to write a tragedy. Aside from anything else, the possibility of a sequel is nonexistent.

— Chris Hadfield