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.
Ursula K. Le GuinIt's probably simply a matter of temperament that I never stopped to wonder if I could "match" what I had done, never choked off my writing by competing with myself, or with anybody else for that matter. My ambition was absolutely centered on the work itself, never on what it would bring me, or "who" it would make me. I never cared about that at all.
Ursula K. Le GuinDo you see, Arren, how an act is not, as young men think, like a rock that one picks up and throws, and it hits or misses, and that's the end of it. When that rock is lifted, the earth is lighter; the hand that bears it is heavier. When it is thrown, the circuits of the stars respond, and where it strikes or falls the universe is changed.
Ursula K. Le Guin