Interesting and true in many cases. It seems that those who know must also discover the device of persuasion.
Plato in Twelve Volumes, Gorgias and Socrates
So he who does not know will be more convincing to those who do not know than he who knows, supposing the orator to be more convincing than the doctor. Is that, or something else, the consequence?
In this case it does follow.
Then the case is the same in all the other arts for the orator and his rhetoric: there is no need to know [459c] the truth of the actual matters, but one merely needs to have discovered some device of persuasion which will make one appear to those who do not know to know better than those who know.
Well, and is it not a great convenience, Socrates, to make oneself a match for the professionals by learning just this single art and omitting all the others?