Two Books of the Elements of Rhetoric (1554) - Page 19

The Greeks, in the beginnings of all books, ask what the intent of the work is, or what the scopus aim is, as they themselves say. The Rhetoricians do the same when they ask about the kind of cause, what the will of the oration is, what it demands, whether knowledge is the end of the oration, or whether it orders something to be done besides knowledge. The following italicized passage is underlined in the original manuscript.
It is most profitable to discern and notice these things in an oration, so that we may understand what utility we should expect from the oration. Nor does the mind of a not-foolish auditor acquiesce until it has foreseen some end of the oration in its mind. I have said these things in many words for this reason, to show that these precepts contribute greatly to forming and sharpening judgments. Furthermore, adolescents should also be warned of this, that the kinds of causes are sometimes mixed. For although every piece of business must be referred principally to one kind of cause, nevertheless often another kind borrows something from the topics of the other, as in the speech for Archias; although the whole oration pertains principally to the Judicial kind, it nevertheless takes many things