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On Justice and Courage: a hortative work in three books. Concerning Theognis, making a fourth and a fifth book. In the third volume are treatises: Of the Good. Of Courage. Of Law, or Of a Commonwealth. Of Law, or Of Goodness and Justice. Of Freedom and Slavery. Of Belief. Of the Guardian, or On Obedience. Of Victory: an economic work. In the fourth volume are included: Cyrus. The Greater Heracles, or Of Strength. The fifth contains: Cyrus, or Of Sovereignty. Aspasia. The sixth: Truth. Of Discussion: a handbook of debate. Satho, or Of Contradiction, in three books.

Such are the lives of the several Cynics. But we will go on to append the doctrines which they held in common – if, that is, we decide that Cynicism is really a philosophy, and not, as some maintain, just a way of life. They are content then, like Ariston of Chios, to do away with the subjects of Logic and Physics and to devote their whole attention to Ethics. And what some assert of Socrates, Diocles records of Diogenes, representing him as saying: "We must inquire into Whate'er of good or ill within our halls is wrought." They also dispense with the ordinary subjects of instruction. At least Antisthenes used to say that those who had attained discretion had better not study literature, lest they should be perverted by alien influences.

They also hold that we should live frugally, eating food for nourishment only and wearing a single garment. Wealth and fame and high birth they despise. Some at all events are vegetarians and drink cold water only and are content with any kind of shelter or tubs, like Diogenes, who used to say that it was the privilege of the gods to need nothing and of god-like men to want but little. They hold, further, that virtue can be taught, as Antisthenes maintains in his Heracles, and when once acquired cannot be lost; and that the wise man is worthy to be loved, impeccable, and a friend to his like; and that we should entrust nothing to fortune. Whatever is intermediate between Virtue and Vice they, in agreement with Ariston of Chios, account indifferent. So much, then, for the Cynics. We must now pass on to the Stoics, whose founder was Zeno, a disciple of Crates.