The characters of the three interlocutors also correspond to the parts which are assigned to them. Gorgias is the great rhetorician, now advanced in years, who goes from city to city displaying his talents, and is celebrated throughout Greece. Like all the Sophists in the dialogues of Plato, he is vain and boastful, yet he has also a certain dignity, and is treated by Socrates with considerable respect. But he is no match for him in dialectics. Although he has been teaching rhetoric all his life, he is still incapable of defining his own art. When his ideas begin to clear up, he is unwilling to admit that rhetoric can be wholly separated from justice and injustice, and this lingering sentiment of morality, or regard for public opinion, enables Socrates to detect him in a contradiction. Like Protagoras, he is described as of a generous nature; he expresses his approbation of Socrates’ manner of approaching a question; he is quite “one of Socrates’ sort, ready to be refuted as well as to refute,” and very eager that Callicles and Socrates should have the game out. He knows by experience that rhetoric exercises great influence over other men, but he is unable to explain the puzzle how rhetoric can teach everything and know nothing. Polus is an impetuous youth, a runaway “colt,” as Socrates describes him, who wanted originally to have taken the place of Gorgias under the pretext that the old man was tired, and now avails himself of the earliest opportunity to enter the lists. He is said to be the author of a work on rhetoric, and is again mentioned in the Phaedrus, as the inventor of balanced or double forms of speech (compare Gorg.; Symp.). At first he is violent and ill-mannered, and is angry at seeing his master overthrown. But in the judicious hands of Socrates he is soon restored to good-humour, and compelled to assent to the required conclusion. Like Gorgias, he is overthrown because he compromises; he is unwilling to say that to do is fairer or more honourable than to suffer injustice. Though he is fascinated by the power of rhetoric, and dazzled by the splendour of success, he is not insensible to higher arguments. Plato may have felt that there would be an incongruity in a youth maintaining the cause of injustice against the world. He has never heard the other side of the question, and he listens to the paradoxes, as they appear to him, of Socrates with evident astonishment. He can hardly understand the meaning of Archelaus being miserable, or of rhetoric being only useful in self-accusation. When the argument with him has fairly run out.