Only a philosopher's mind grows wings, since its memory always keeps it as close as possible to those realities by being close to which the gods are divine.
We are like people looking for something they have in their hands all the time; we're looking in all directions except at the thing we want, which is probably why we haven't found it.
Thus rhetoric, it seems, is a producer of persuasion for belief, not for instruction in the matter of right and wrong ... And so the rhetorician's business is not to instruct a law court or a public meeting in matters of right and wrong, but only to make them believe.