Do not change anything until you know the consequences

The rule "Do not not change anything until you know the consequences" is a foundational ethical principle of wizardry in Earthsea, articulated by the Master Hand on Roke. It warns that every act of true magic, especially Changing and Summoning, alters the world's Equilibrium and carries unforeseen repercussions, and that a wizard must therefore act only from knowledge and genuine need, never from pride or whim.

Origin and Statement of the Rule

The principle is first stated explicitly by the Master Hand, a gentle and light-hearted old man who taught the lesser arts of illusion in the Court of Seeming on Roke. When Ged, eager to surpass his rival Jasper, asked how to make a pebble changed into a diamond remain diamond permanently, the Master Hand did not grant the request. Instead he turned the jewel back to a rough grey bit of rock and held it out, saying, "This is a rock; tolk in the True Speech. A bit of the stone of which Roke Isle is made, a little bit of the dry land on which men live. It is itself. It is part of the world." He then demonstrated that the Illusion-Change could make it look like a diamond, a flower, a fly, an eye, or a flame, but that was mere seeming, fooling the beholder's senses without changing the thing itself. To truly change the rock into a jewel, he explained, one must change its true name, and to do that "even to so small a scrap of the world, is to change the world. It can be done. Indeed it can be done. It is the art of the Master Changer, and you will learn it, when you are ready to learn it. 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." He grounded this warning in the concept of Equilibrium: "The world is in balance, in Equilibrium. A wizard's power of Changing and of Summoning can shake the balance of the world. It is dangerous, that power. It is most perilous. It must follow knowledge, and serve need." He concluded with a resonant image: "To light a candle is to cast a shadow."

The Rule in Practice: Consequences of Violation

Ged's entire story is a demonstration of the rule's necessity through its violation. His first act of power, the fog-weaving at Ten Alders, was a desperate, need-driven spell that saved his village from Kargish raiders, but it also overspent his strength and left him speechless and near death, requiring Ogion's healing. His first deliberate transgression came when, goaded by the girl Serret's mockery, he opened Ogion's Lore-Books without permission and read a spell of summoning up the spirits of the dead. The act summoned not a spirit but a shapeless clot of shadow that crouched beside the door and reached out to him, a horror dispelled only by Ogion's sudden, radiant return. Ogion rebuked him: "You will never work that spell but in peril of your power and your life." The most catastrophic violation occurred on Roke Knoll, when Ged, driven by pride and hatred of Jasper, performed the same Summoning spell aloud. He called the spirit of Elfarran, but with it came an unnamed shadow-beast that tore at his flesh and fled into the world. The Archmage Nemmerle spent all his power to drive the shadow off and save Ged, and died as a result. The Master Summoner later told Ged that only a great power could have summoned such a thing, and that Ged must find out what it means "or die, and worse than die." The shadow pursued Ged across Earthsea, possessing the Osskilian oarsman Skiorh and nearly destroying Ged in the Court of the Terrenon, where the Old Power of the Stone tried to enslave him. Ged's eventual victory came not through more power but through understanding: on the Open Sea, he named the shadow with his own name, "Ged," and the two voices became one, healing the breach he had made. The Master Namer Kurremkarmerruk had earlier explained the deeper reason for the rule: "Thus, that which gives us the power to work magic sets the limits of that power. A mage can control only what is near him, what he can name exactly and wholly. And this is well. If it were not so, the wickedness of the powerful or the folly of the wise would long ago have sought to change what cannot be changed, and Equilibrium would fail."

The Rule's Thematic Significance

The rule is not merely a technical restriction but a moral and metaphysical law that defines the wizard's role in the world. It distinguishes true wizardry, which serves the Balance, from the selfish or reckless use of power that leads to ruin. The Master Hand's gentle lesson—"Enjoy illusions, lad, and let the rocks be rocks"—contrasts with Ged's youthful desire for mastery without responsibility. Ogion's teaching, "To hear, one must be silent," and his insistence that Ged learn the fourfoil in all its seasons before learning its true name, embody the patience and humility the rule demands. The rule also connects to the nature of the Old Speech, which binds a man to truth, and to the dragons' ability to lie in it, showing that language itself is a power that must be used with care. Ged's final confrontation with the shadow, where he speaks its name as his own, is the ultimate act of knowing the consequences: he accepts the shadow as part of himself, and in doing so, heals the wound and becomes whole. The rule thus becomes the key to his transformation from a prideful boy to a true mage who understands that "the wise man is one who never sets himself apart from other living things."