Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Further, the true orator will not turn up his nose at cases of minor importance on the ground of their being beneath his dignity or as being likely to detract from his reputation because the subject matter does not allow his genius full scope. For the strongest reason for undertaking a case is to be fund in our duty towards our clients: nay, we should even desire the suits in which our friends are involved to he as unimportant as possible, and remember that the advocate who gives an adequate presentment to his case, has spoken exceeding well.
But there are so he who, even although the cases which they have undertaken give but small scope for eloquence, none the less trick it out with matter drawn from without and, if all else fails, fill up the gaps in their case with abuse of their opponents, true if possible, but false if necessary, the sole consideration that weighs with them being that it affords exercise for their talents and is likely to win applause during its delivery. Such conduct seems to me so unworthy of our perfect orator that, in my opinion, he will not even bring true charges against his opponents unless the case demand.
For it is a dog's eloquence, as Appius says, to undertake the task of abusing one's opponent, [*](A cognitor is one who represents another. The litigant may abuse his opponent, but that does not justify his advocate in doing so. ) and they who do so should steel themselves in advance to the prospect of being targets for like abuse themselves, since those who adopt this style of pleading are frequently attacked themselves, and there can at any rate be no doubt that the litigant pays dearly for the violence
It is not uncommon for the litigant to demand a base and inhuman gratification of his rancour, such as not a single man among the audience will approve, for it is on revenge rather than on protection that his heart is set. But in this, as in a number of other points, it is the duty of the orator to refuse to comply with his clients' desires. For how can a man with the least degree of gentlemanly feeling consent to make a brutal attack merely because another desires it?