The narration should depict character; to which end you must know what makes it do so. One such thing is the indication of moral purpose; the quality of purpose indicated determines the quality of character depicted and is itself determined by the end pursued. Thus it is that mathematical discourses depict no character; they have nothing to do with moral purpose, for they represent nobody as pursuing any end. On the other hand, the Socratic dialogues do depict character, being concerned with moral questions. This end will also be gained by describing the manifestations of various types of character, e.g. 'he kept walking along as he talked', which shows the man's recklessness and rough manners. Do not let your words seem inspired so much by intelligence, in the manner now current, as by moral purpose: e.g. 'I willed this; aye, it was my moral purpose; true, I gained nothing by it, still it is better thus.'
For the other way shows good sense, but this shows good character; good sense ****** us go after what is useful, and good character after what is noble. Where any detail may appear incredible, then add the cause of it; of this Sophocles provides an example in the Antigone, where Antigone says she had cared more for her brother than for husband or children, since if the latter perished they might be replaced, But since my father and mother in their graves Lie dead, no brother can be born to me.
If you have no such cause to suggest, just say that you are aware that no one will believe your words, but the fact remains that such is our nature, however hard the world may find it to believe that a man deliberately does anything except what pays him.
Again, you must make use of the emotions. Relate the familiar manifestations of them, and those that distinguish yourself and your opponent; for instance, 'he went away scowling at me'. So Aeschines described Cratylus as 'hissing with fury and shaking his fists'. These details carry conviction: the audience take the truth of what they know as so much evidence for the truth of what they do not. Plenty of such details may be found in Homer:
Thus did she say: but the old woman buried her face in her hands: a true touch-people beginning to cry do put their hands over their eyes.
Bring yourself on the stage from the first in the right character, that people may regard you in that light; and the same with your adversary; but do not let them see what you are about. How easily such impressions may be conveyed we can see from the way in which we get some inkling of things we know nothing of by the mere look of the messenger bringing news of them. Have some narrative in many different parts of your speech; and sometimes let there be none at the beginning of it.
In political oratory there is very little opening for narration; nobody can 'narrate' what has not yet happened. If there is narration at all, it will be of past events, the recollection of which is to help the hearers to make better plans for the future. Or it may be employed to attack some one's character, or to eulogize him-only then you will not be doing what the political speaker, as such, has to do.
If any statement you make is hard to believe, you must guarantee its truth, and at once offer an explanation, and then furnish it with such particulars as will be expected. Thus Carcinus' Jocasta, in his Oedipus, keeps guaranteeing the truth of her answers to the inquiries of the man who is seeking her son; and so with Haemon in Sophocles.