Kitap 2
1.1
Such then are the materials which we must employ in exhorting and dissuading, praising and blaming, accusing and defending, and such are the opinions and propositions that are useful to produce conviction in these circumstances; for they are the subject and source of enthymemes, which are specially suitable to each class (so to say) of speeches.This is Cope's interpretation. Jebb renders: If we take each branch of Rhetoric by itself. The classes are of course the deliberative, forensic, and epideictic.
1.2
But since the object of Rhetoric is judgement—for judgements are pronounced in deliberative rhetoric and judicial proceedings are a judgement—it is not only necessary to consider how to make the speech itself demonstrative and convincing, but also that the speaker should show himself to be of a certain character and should know how to put the judge into a certain frame of mind.