4. As reported at the beginning of Plato’s Meno. Gorgias was a ‘sophist’ of the fifth century.

5. Sophocles, Ajax 293.

6. Aristotle expresses himself rather mysteriously, but he probably means that the craftsman, though legally free, is ‘slavish’ because of his occupation, and like the slave attains moral virtue only in so far as he is controlled and instructed by a master/employer.