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19.1
OF the other parts of tragedy enough has now been said. But it remains that we should speak concerning the diction and the sentiments. The particulars, therefore, respecting the sentiments, are unfolded in the treatise on Rhetoric, to which it more properly belongs.
19.2
But those things pertain to the sentiments, which it is requisite to procure by a reasoning process.
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And the parts of these are, to demonstrate, to refute, and to excite the passions; such as pity, or fear, or anger, and such like; and besides these, to amplify and extenuate.
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It is evident, however, that in things, also, it is requisite to derive what is useful from the same forms,
19.3
when it is necessary to procure objects of pity, or things that are dreadful, or great, or probable. Except that there is this difference, that things in tragedy ought to be rendered apparent without teaching,
19.4
but in an oration they are to be shown by the speaker, and in consequence of the speech.
19.5
For what employment would there be for the orator, if the things should appear [of themselves] pleasing,
19.6
and not through the speech ?
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But of things pertaining to diction, there is one species of theory respecting the forms of speech 1, which it is the pro-
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vince of the actor to know, and of him who is a master artist in this profession. Thus, or instance, [it is requisite he should know,] what a mandate is, what a prayer, narration, threats, interrogation and answer are,
19.7
and whatever else there may be of this kind.
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For from the knowledge or ignorance of these, the poetic art incurs no blame of any moment. For who would think that Homer errs in what he is reproved for by Protagoras? viz. that while he fancies he prays, he commands,
19.8
when he says, " The wrath, O goddess, sing." For, says he, to order a thing to be done, or not to be done, is a mandate.
19.9
Hence, this must be omitted as a theorem pertaining to another art, and not to poetry.