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"A little learning is a dangerous thing.
Drink deep, or taste not the Pierian Spring;
There shallow draughts intoxicate the brain,
and drinking largely sobers us again."

- Alexander Pope, An Essay on Criticism

Alexander Pope (c. 1727), an English poet best known for his Essay on Criticism, The Rape of the Lock and The Dunciad

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http://en.wikipedia.org/wiki/Alexander_Pope