Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Akin to this are those figures of which the Greeks are so fond, by means of which they give gentle expression to unpleasing facts. Themistocles, for example, is believed to have urged the Athenians to commit their city to the protection of heaven, because to urge them to abandon it would have been too brutal an expression. Again the statesman [*](Unknown.) who advised that certain golden images of Victory should be melted down as a contribution to the war funds, modified his words by saying that they should make a proper use of their victories. But all such devices which consist in saying one thing, while intending something else to be understood, have a strong resemblance to allegory.
It has also been asked how figures may best be met. Some hold that they should always be exposed by the antagonist, just as hidden ulcers are laid open by the surgeon. It is true that this is often the right course, being the only means of refuting the charges which have been brought against us, and this is more especially the case when the question turns on the very point at which the figures are directed. But when the figures are merely employed as vehicles of abuse, it will sometimes even be wisest to show that we have a clear conscience by ignoring them.