“…However, in a later work, Phaedrus (1999b), Plato did lay out what he saw as the requirements for a true art of rhetoric by finding, in part, that it can only involve private speech, because public speech does not take into account the differences between men. Nichols (1987) has argued that Aristotle's treatise, On Rhetoric, can be seen as a defense of rhetoric against the attacks made by Plato and Aristophanes. Contrary to the charge that rhetoric subverts what Aristophanes called "established social beliefs," Nichols argued that the Aristotelian conception of rhetoric subordinates itself to "commonly held opinions about what is good, noble, and just" (1987, p. 660). She pointed out, however, that, according to Aristotle, the rhetorician must move beyond common opinion, because "common opinion is not homogeneous," and is "composed of a diversity of elements, which may be in contradiction with one another" (Nichols, 1987, p. 660).…”