When Plato apparently quotes Socrates in "The Republic", it is only to add dramatic effect to the presentation of his own thought. For this reason, Plato's writings on Socrates tell us little, at least directly, about Socrates. The historical figure is used only as a device for communicating Plato's ideas. In classical Rome, students of rhetoric had to master the "suasoria" — a form of declamation in which they wrote the soliloquy of a historical figure who was debating a critical course of action. For example, the poet Juvenal wrote a speech for the dictator Sulla, in which he was counselled to retire. The poet Ovid enjoyed this exercise more than the other final challenge — the "controversia".