Gorgias is a dialogue about the worth of rhetoric and, through it, about how a person ought to live. Socrates, having just missed a public display by the famous teacher Gorgias, asks instead to question him about what his art actually is. The conversation moves through three opponents, each more combative than the last: Gorgias, his pupil Polus, and the politician Callicles.
With Gorgias, Socrates exposes a tension. Rhetoric claims to produce persuasion about justice, yet a teacher of rhetoric does not claim to make pupils just. Socrates draws a sharp distinction: some practices, like medicine and gymnastic, genuinely care for the body and soul, while others only flatter by aiming at pleasure. On this view rhetoric, as commonly practised, stands to justice as cookery stands to medicine, a knack for gratification rather than a real art.
Polus takes over to defend rhetoric's power, pointing to orators and tyrants who do as they please. Socrates answers with his central paradox: such power is not enviable, because doing injustice is a greater evil than suffering it, and escaping punishment for wrongdoing is worse still. If the soul is diseased by injustice, then being corrected is a benefit, much as a sick body benefits from a painful cure.
Callicles rejects all of this as convention. He argues that by nature the stronger and more capable should rule and should let their desires grow as large as possible. Socrates replies that a life of endless craving is like trying to fill leaking jars; it has no rest and no satisfaction. He insists that pleasure and good are not the same, and that some pleasures are bad while some pains are beneficial.
The dialogue closes by binding happiness to inner order. The temperate soul, being just, holy, and courageous, is the good soul, and the good person acts well and is therefore happy. Socrates calls himself almost the only true statesman of his day because he aims at making citizens better rather than merely pleasing them. A concluding myth of judgment after death restates the lesson in a figure: a person should care for the reality of virtue, not its appearance, and should use speech and every other art in the service of justice.