Aristotle writes that persuasion is based on three things: the ethos, or personal character of the speaker; the pathos, or getting the audience into the right kind of emotional receptivity; and the logos, or the argument itself, carried out by abbreviated syllogisms, or something like deductive syllogisms, and by the use of example.

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Any restrictions to freedom of expression will always open the door to possible others, because analogical reasoning can mount arguments showing why this or that class of objects is closely similar to those for which exceptions have been made.

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