Institutio Oratoria

But if, as is

The point, however, that gives rise to the greatest number of these captious accusations against rhetoric, is found in the allegation that orators speak indifferently on either side of a case. From which they draw the following arguments: no art is self-contradictory, but rhetoric does contradict itself; no art tries to demolish what itself has built, but this does happen in the operations of rhetoric; or again:— rhetoric teaches either what ought to be said or what ought not to be said; consequently it is not an art because it teaches what ought not to be said, or because, while it teaches what ought to be said, it also teaches precisely the opposite.

Now it is obvious that all such charges are brought against that type of rhetoric with which neither good men nor virtue herself will have anything to do; since if a case be based on injustice, rhetoric has no place therein and consequently it can scarcely happen even under the most exceptional circumstances that an orator, that is to say, a good man, will speak indifferently on either side.