1 Justice (the political art) must be something as definite as the special arts, yet of universal scope. This twofold requirement no definition of a virtue in the minor dialogues is ever able to satisfy. It is met only by the theory worked out in the Republic. Cf. Unity of Plato's Thought, p. 14.
2 Justice is more nearly defined as having to do with money or legal obligations—the common-sense view to which Aristotle inclines.
3 Interest is ignored. Aristotle, Eth. Nic. 1120 a 9, splits hairs on this.
4 A virtue is presumably a good. A defintion that makes justice useless is ipso facto refuted. This line of argument is a standardized procedure in the minor dialogues. Cf. my Unity of Plato's Thought, n. 78. The argument continues: The arts are faculties of opposites. The fallacy is intentional, as in Hippias Minor 365, where it is argued that the voluntary lie is better than the involuntary. This impressed Aristotle, who met it with his distinction between habit and faculty (ἕξις and δύναμις). Cf Topics, vi. 12. 6, Eth. Nic. v. 1. 4, vi. 5. 7, Met. 1046 b, Unity of Plato's Thought, n. 38.
5 The shift from the active to the middle here helps Plato to his transition from guarding to guarding against.
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