 The notion of ‘dialectic’ is prominent in the work of Aristotle’s teacher, Plato; Plato often labels his philosophical method, or certain parts of it, as dialectic. In his dialogue Gorgias (see §4 of  Plato: rhetoric and poetry),  dialectic seems to be strictly opposed to rhetoric, the former aiming at the disclosure of truth, the latter allegedly aiming at ‘persuasion without knowledge’. In his Phaedrus Plato pictures the relation between dialectic and rhetoric in a different way (see §5.1 of  Plato: rhetoric and poetry);  here he entertains the idea of a new philosophical rhetoric, quite different from the then contemporary style of speech writing, which rests upon dialectic, the genuine philosophical method, for acquiring genuine knowledge both of the subject matter of a speech and of the soul of the audience. When Aristotle speaks of dialectic, he certainly has his book Topics in mind, where he develops at some length an argumentative method for attacking and defending theses of any content (see §8 of  Aristotle: logic).  Clearly, Aristotle’s dialectical method was inspired by Plato and by the debates in Plato’s Academy; however, while Plato often presents dialectic as a method for discovering and conveying truth, Aristotelian dialectic is strictly confined to examining particular claims or testing the consistency of a set of propositions (which in his view is different from establishing or proving the truth of a proposition). This is, in a nutshell, the context that must be kept in mind, when Aristotle presents — quite allusively — a new art of rhetoric by stressing its affinity to dialectic; obviously he plays upon his readers’ expectations concerning the meaning of dialectic and the relation between dialectic and rhetoric, as described by Plato. Those students of Plato’s Academy who were still suspicious about any engagement with rhetoric and public speech possibly received the opening of Aristotle’s Rhetoric with its postulated affinity between rhetoric and dialectic either as a provoction or as some sort of joke.