Book 1
4.3
Indeed, even in the case of things that are possible advice is not universally appropriate; for they include certain advantages, natural and accidental, about which it is not worth while to offer advice. But it is clear that advice is limited to those subjects about which we take counsel; and such are all those which can naturally be referred to ourselves and the first cause of whose origination is in our own power; for our examination is limited to finding out whether such things are possible or impossible for us to perform.
4.4
However, there is no need at present to endeavor to enumerate with scrupulous exactness or to classify those subjects which men are wont to discuss, or to define them as far as possible with strict accuracy, since this is not the function of the rhetorical art but of one that is more intelligent and exact, and further, more than its legitimate subjects of inquiry have already been assigned to it.
4.5
For what we have said before is trueThe analytical science is Dialectic, incorrectly regarded as a branch of Analytics, which properly implies scientific demonstration.: that Rhetoric is composed of analytical science and of that branch of political science which is concerned with Ethics, and that it resembles partly Dialectic and partly sophistical arguments.
