Tact and judgement are needed in all varieties of oratory. The form of the language should not be metrical, nor, on the other hand, without any rhythm at all. Of the various possible rhythms, the heroic is too grand, the iambic too ordinary, and the trochaic too like a riotous dance. The best rhythm for prose is the paean, since from this alone no definite metre arises. A period may be defined as a portion of speech that has in itself a beginning and an end, being at the same time not too big to be taken in at a glance.
Antithesis implies contrast of sense.
Parisosis makes the two members of a period equal in length. Paromoeosis makes the first or last worlds of both members like each other. Homoeoteleuton denotes similarity in terminations only. A touch of surprise also contributes to liveliness. Similes, proverbs, and hyperboles also find a place here, being related to metaphors.