Socrates says the role of a true rhetoric is to improve the people by ending their ignorance, rather than pleasing them. But Callicles argues that he must develop his full talents to know who he is and that means becoming a man in the city. Socrates is shocked and starts making long speeches pleading with Callicles to give up his views. Callicles will have none of it. The afterworld in which we will be judged is based on our true nature not the appearance we leave in the city.
Rhetoric is concerned with appearance, philosophy is concerned with reality.
E. The Phaedrus explores the noble in three interesting speeches about love and rhetoric. Phaedrus has just heard a speech about love by the Sophist Lysias, and he thinks it is the best speech he has ever heard. Socrates proceeds to pick the speech apart after Phaedrus repeats it. Believe it because it is true. He concludes that Lysias speech has been delivered without true knowledge of the subject matter.