Institutio Oratoria

For when we have done all this, we may still account ourselves only too fortunate if we have succeeded in communicating the fire of our passion to the judge: consequently, we can have no hope of moving him if we speak with languor and indifference, nor of preventing him from yielding to the narcotic influence of our own yawns.

A proof of this is given by actors in the theatre. For they add so much to the charm even of the greatest poets, that the verse moves us far more when heard than when read, while they succeed in securing a hearing even for the most worthless authors, with the result that they repeatedly win a welcome on the stage that is denied them in the library.

Now if delivery can count for so much in themes which we know to be fictitious and devoid of reality, as to arouse our anger, our tears or our anxiety, how much greater must its effect be when we actually believe what we hear? For my own part I would not hesitate to assert that a mediocre speech supported by all the power of delivery will be more impressive than the best speech unaccompanied by such power.