Rhetoric, after all, being the art of persuading people to accept something, whether it is true or false, would anyone dare to maintain that truth should stand there without any weapons in the hands of its defenders against falsehood; that those speakers, that is to say, who are trying to convince their hearers of what is untrue, should know how to get them on their side, to gain their attention and have them eating out of their hands by their opening remarks, while these who are defending the truth should not? That those should utter their lies briefly, clearly, plausibly, and these should state their truths in a manner too boring to listen to, too obscure to understand, and finally too repellent to believe? That those should attack the truth with specious arguments, and assert falsehoods, while these should be incapable of either defending the truth or refuting falsehood? that those, to move and force the minds of their hearers into error, should be able by their style to terrify them, move them to tears, make them laugh, give them rousing encouragement, while these on behalf of truth stumble along slow, cold and half asleep?
De Doctrina Christiana IV.2.3. Translation by Edmund Hill.