while still greater care is required in teaching all the tropes See Book VIII. chap. vi. which are employed for the adornment more especially of poetry, but of oratory as well, and in making his class acquainted with the two sorts of schemata or figures known as figures of speech and figures of thought. See Book chaps. i. and ii. A trope is an expression used in a sense which it cannot strictly bear. A figure is a form of speech differing from the ordinary method of expression; see IX i. 4. I shall however postpone discussion of tropes and figures till I come to deal with the various ornaments of style.

Above all he will impress upon their minds the value of proper arrangement, and of graceful treatment of the matter in hand: he will show what is appropriate to the various characters, what is praiseworthy in the thoughts or words, where copious diction is to be commended and where restraint.

In addition to this he will explain the various stories that occur: this must be done with care, but should not be encumbered with superfluous detail. For it is sufficient to set forth the version which is generally received or at any rate rests upon good authority. But to ferret out everything that has ever been said on the subject even by the most worthless of writers is a sign of tiresome pedantry or empty ostentation, and results in delaying and swamping the mind when it would be better employed on other themes.

The man who pores over every page even though it be wholly unworthy of reading, is capable of devoting his attention to the investigation of old wives' tales. And yet the commentaries of teachers of literature are full of such encumbrances to learning and strangely unfamiliar to their own authors.

It is, for instance, recorded that Didymus, who was unsurpassed for the number of books which he wrote, on one occasion objected to some story as being absurd, whereupon one of his own books was produced which contained the story in question.

Such abuses occur chiefly in connexion with fabulous stories and are sometimes carried to ludicrous or even scandalous extremes: for in such cases the more unscrupulous commentator has such full scope for invention, that he can tell lies to his heart's content about whole books and authors without fear of detection: for what never existed can obviously never be found, whereas if the subject is familiar the careful investigator will often detect the fraud. Consequently I shall count it a merit in a teacher of literature that there should be some things which he does not know.