Quintilian from Institutes of Oratory

I thought Quintilian's approach to finding a suitable definition for "oratory" was, perhaps, too in depth, but interesting all the same. Though his final definition of oratory- the art of speaking well- was vague, it was perfectly appropriate because oratory itself is vague in it's application. It certainly is not restricted to persuade  when discussing affairs of the state. As I see it, you can just as easily give an oratory on the importance of not wearing white after Labor Day as you can on foreign diplomacy. Also, oratory is not a practice that is limited to the just or truthful either. Adolf Hitler, who is as far from just and truthful as a person can be, is considered one of the greatest orators history has ever seen. When it all boils down, oratory is an unrestricted art that is almost always used by the speaker to gain power or advantage in society.