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1 The assumption that a thing is what it is like is put as an inference from Thrasymachus's ready admission that the unjust man is wise and good and is like the wise and good. Jevons says in “Substitution of Similars”; “Whatever is true of a thing is true of its like.” But practical logic requires the qualification “in respect of their likness.” Socrates, however, argues that since the good man is like the good craftsman in not overreaching, and the good craftsman is good, therefore the just man is good. The conclusion is sound, and the analogy may have a basis of psychological truth; but the argument is a verbal fallacy.
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