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Rhetoric then may be defined as the faculty of discovering the possible means of persuasion in reference to any subject whatever. This is the function of no other of the arts, each of which is able to instruct and persuade in its own special subject; thus, medicine deals with health and sickness, geometry with the properties of magnitudes, arithmetic with number, and similarly with all the other arts and sciences. But Rhetoric, so to say, appears to be able to discover the means of persuasion in reference to any given subject. That is why we say that as an art its rules are not applied to any particular definite class of things.

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