Book 3
8.4
Of the different rhythms the heroic is dignified, but lacking the harmony of ordinary conversation; the iambic is the language of the many, wherefore of all meters it is most used in common speech; but speech should be dignified and calculated to rouse the hearer. The trochaic is too much like the cordax; this is clear from the tetrameters, which form a tripping rhythm. There remains the paean, used by rhetoricians from the time of Thrasymachus, although they could not define it.
8.4
The paean is a third kind of rhythm closely related to those already mentioned; for its proportion is 3 to 2, that of the others 1 to 1 and 2 to 1, with both of which the paean, whose proportion is 1 1/2 to 1, is connected.The heroic rhythm (dactyls, spondees, and anapests) is as 1 to 1, two short syllables being equal to one long; trochaic and iambic 2 to 1 on the same principle; paean, 3 to 2 (three shorts and one long), being the mean between the other two.
8.5
All the other meters then are to be disregarded for the reasons stated, and also because they are metrical; but the paean should be retained, because it is the only one of the rhythms mentioned which is not adapted to a metrical system, so that it is most likely to be undetected.
