The use of the Old Speech binds a man to truth

The use of the Old Speech binds a man to truth is a foundational law of magic in Earthsea, distinguishing human wizardry from the speech of dragons and the powers of the earth. The Old Speech is the language in which things are named with their true names, the tongue Segoy spoke when he raised the islands of the world from the sea, and the language dragons still speak. For a human, to speak in the Old Speech is to commit oneself to absolute truthfulness; the words themselves carry the weight of reality and cannot be used to deceive. This rule is not a mere convention but an inherent property of the language, woven into the fabric of magic itself.

The Nature of the Old Speech and Its Binding Power

The Old Speech is the source of all true magic. As the Master Namer Kurremkarmerruk teaches his pupils at the Isolate Tower on Roke, magic consists in the true naming of a thing, and the words of the Old Speech are the true names of all things. The Hardic tongue of the Archipelago has its roots in the Old Speech, but only the ancient language itself carries the power to command reality. When a human wizard speaks a word of the Old Speech, he is not merely describing the world but acting upon it, and the language itself enforces truthfulness because a false statement in the Old Speech would be a contradiction in terms—a lie cannot be spoken in the language of truth. This is why the witch of Ten Alders, when she first teaches young Duny a rhyme in the Old Speech to call the goats, does so with a binding spell that prevents him from speaking the word where another person can hear it; the power of the language must be guarded.

The Contrast with Dragons: Truth and Deception

Dragons, however, are not bound by this rule. As Ged learns during his confrontation with the Dragon of Pendor, Yevaud, dragons speak the Old Speech as their native tongue, and they can lie in it, twisting true words to false ends. The narrator explicitly states that although the use of the Old Speech binds a man to truth, this is not so with dragons; it is their own language, and they can lie in it, catching the unwary hearer in a maze of mirrorwords each of which reflects the truth and none of which leads anywhere. This fundamental asymmetry makes dealing with dragons extraordinarily perilous for human wizards, as Ged discovers when Yevaud offers to tell him the name of the shadow that hunts him—an offer that might be true but is made wholly for the dragon's own ends. The dragon's ability to lie in the Old Speech is a mark of their ancient, alien nature, a power that humans cannot match.

The Rule in Action: Naming, Oaths, and the Final Confrontation

The binding power of the Old Speech is demonstrated in several pivotal moments. When Ged speaks Yevaud's true name, "Yevaud," aloud, he gains mastery over the dragon, forcing him to swear by his name never to come to the Archipelago. The oath, spoken in the Old Speech, is absolute and cannot be broken, even though the dragon rages against it. Similarly, in the final confrontation on the Open Sea, when Ged and the shadow meet face to face, they speak the same word simultaneously: "Ged." The shadow, which had no name and was a creature of unlife, is forced by the power of the Old Speech to speak its own true name—which is Ged's name, revealing that the shadow is his own dark self. This act of naming, performed in the Old Speech, completes the integration of light and darkness within Ged, healing the wound and making him whole. The rule that the Old Speech binds a man to truth is thus not merely a restriction but a source of ultimate power: it compels reality to conform to the spoken word, and in the hands of a wizard who understands its nature, it can be used to master even the most formless evil.