But, they say, he does not know whether the cause which he has undertaken is true. But not even a doctor can tell whether a patient who claims to be suffering from a headache, really is so suffering: but he will treat him on the assumption that his statement is true, and medicine will still be an art. Again what of the fact that rhetoric does not always aim at telling the truth, but always at stating what is probable? The answer is that the orator knows that what he states is no more than probable.

My opponents further object that advocates often defend in one case what they have attacked in another. This is not the fault of the art, but of the man. Such are the main points that are urged against rhetoric; there are others as well, but they are of minor importance and drawn from the same sources. That rhetoric is an art may, however,

be proved in a very few words. For if Cleanthes Fr. 790. definition be accepted that Art is a power reaching its ends by a definite path, that is, by ordered methods, no one can doubt that there is such method and order in good speaking: while if, on the other hand, we accept the definition which meets with almost universal approval that art consists in perceptions agreeing and cooperating to the achievement of some useful end, we shall be able to show that rhetoric lacks none of these characteristics.

Again it is scarcely necessary for me to point out that like other arts it is based on examination and practice. And if logic is an art, as is generally agreed, rhetoric must also be an art, since it differs from logic in species rather than in genus. Nor must I omit to point out that where it is possible in any given subject for one man to act without art and another with art, there must necessarily be an art in connexion with that subject, as there must also be in any subject in which the man who has received instruction is the superior of him who has not.

But as regards the practice of rhetoric, it is not merely the case that the trained speaker will get the better of the untrained. For even the trained man will prove inferior to one who has received a better training. If this were not so, there would not be so many rhetorical rules, nor would so many great men have come forward to teach them. The truth of this must be acknowledged by everyone, but more especially by us, since we concede the possession of oratory to none save the good man. i.e. since our ideals are so high.