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The best thing for being sad is to learn something. That is the only thing that never fails. You may grow old and trembling in your anatomies. You may lie awake at night listening to the disorder of your veins. You may miss your only love. You may see the world around you devastated by evil lunatics or know your honor trampled in the sewers of baser minds. There is only one thing for it, then: to learn. Learn why the world wags and what wags it. That is the only thing which the mind can never exhaust, never alienate, never be tortured by, never fear or distrust, and never dream of regretting. Learning is the thing for you.
– T.H. White. The Once and Future King NY: Ace Books, 1987, p.183