But you must not change one thing, one pebble, one grain of sand, until you know what good and evil will follow on that act. The world is in balance, in Equilibrium. A wizard's power of Changing and Summoning can shake the balance of the world. It is dangerous, that power...It must follow knowledge, and serve need.

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About Ursula K. Le Guin

Ursula K. Le Guin was a 20th-century American author. Ursula Kroeber Le Guin was an American author. She is best known for her works of speculative fiction, including science fiction works set in her Hainish universe, and the Earthsea fantasy series. Read more on Wikipedia →

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