Rhetoric may be defined as the faculty of observing in any given case the available means of persuasion. This is not a function of any other art.Aristotle
Persuasion is achieved by the speaker's personal character when the speech is so spoken as to make us think him credible. We believe good men more fully and more readily than others: this is true generally whatever the question is, and absolutely true where exact certainty is impossible and opinions are divided.Aristotle
In making a speech one must study three points: first, the means of producing persuasion; second, the language; third the proper arrangement of the various parts of the speech.Aristotle
Persuasion is clearly a sort of demonstration, since we are most fully persuaded when we consider a thing to have been demonstrated.Aristotle
Some animals utter a loud cry. Some are silent, and others have a voice, which in some cases may be expressed by a word; in others, it cannot. There are also noisy animals and silent animals, musical and unmusical kinds, but they are mostly noisy about the breeding season.Aristotle
The duty of rhetoric is to deal with such matters as we deliberate upon without arts or systems to guide us, in the hearing of persons who cannot take in at a glance a complicated argument or follow a long chain of reasoning.Aristotle
Those disputing, contradicting, and confuting people are generally unfortunate in their affairs. They get victory, sometimes, but they never get good will, which would be of more use to them.Benjamin Franklin