"Many receive a criticism and think it is fine; think they got their money's worth; think well of the teacher for it, and then go on with their work just the same as before. That is the reason much of the wisdom of Plato is still locked up in the pages of Plato."

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I made a series of wrong decisions about moderately recent books, and I've sold the rights to studios for ridiculous amounts of money and the films have never been made. That's the saddest thing of all, because they're locked up and no-one else can make them.

— John le Carre