Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

But though the orator will as a rule maintain what is true, this will not always be the case: there are occasions when the public interest demands that he should defend what is untrue. The following objections are also put forward in the second book of Cicero's de Oratore: [*](II. vii. 30.) —

Art deals with things that are known. But the pleading of an orator is based entirely on opinion, not on knowledge, because he speaks to an audience who do not know,
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and sometimes himself states things of which he has no actual knowledge.

Now one of these points, namely whether the judges have knowledge of what is being said to them, has nothing to do with the art of oratory. The other statement, that art is concerned with things that are known, does however require an answer. Rhetoric is the art of speaking well and the orator knows how to speak well.

But,
it is urged,
he does not know whether what he says is true.
Neither do they, who assert that all things derive their origin from fire or water or the four elements or indivisible atoms; nor they who calculate the distances of the stars or the size of the earth and sun. And yet all these call the subject which they teach an art. But if reason makes them seem not merely to hold opinions but, thanks to the cogency of the proofs adduced, to have actual knowledge, reason will do the same service to the orator.

But,
they say,
he does not know whether the cause which he has undertaken is true.
But not even a doctor can tell whether a patient who claims to be suffering from a headache, really is so suffering: but he will treat him on the assumption that his statement is true, and medicine will still be an art. Again what of the fact that rhetoric does not always aim at telling the truth, but always at stating what is probable? The answer is that the orator knows that what he states is no more than probable.

My opponents further object that advocates often defend in one case what they have attacked in another. This is not the fault of the art, but of the man. Such are the main points that are urged against rhetoric; there are others as well, but they are of minor importance and drawn from the same sources.

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That rhetoric is an art may, however,

be proved in a very few words. For if Cleanthes [*](Fr. 790.) definition be accepted that

Art is a power reaching its ends by a definite path, that is, by ordered methods,
no one can doubt that there is such method and order in good speaking: while if, on the other hand, we accept the definition which meets with almost universal approval that art consists in perceptions agreeing and cooperating to the achievement of some useful end, we shall be able to show that rhetoric lacks none of these characteristics.

Again it is scarcely necessary for me to point out that like other arts it is based on examination and practice. And if logic is an art, as is generally agreed, rhetoric must also be an art, since it differs from logic in species rather than in genus. Nor must I omit to point out that where it is possible in any given subject for one man to act without art and another with art, there must necessarily be an art in connexion with that subject, as there must also be in any subject in which the man who has received instruction is the superior of him who has not.