Vitae philosophorum
Diogenes Laertius
Diogenes Laertius. Hicks, R. D., editor. Cambridge, MA.: Harvard University Press; London: William Heinemann Ltd., 1925.
It is a tenet of theirs that between virtue and vice there is nothing intermediate, whereas according to the Peripatetics there is, namely, the state of moral improvement. For, say the Stoics, just as a stick must be either straight or crooked, so a man must be either just or unjust. Nor again are there degrees of justice and injustice; and the same rule applies to the other virtues. Further, while Chrysippus holds that virtue can be lost, Cleanthes maintains that it cannot. According to the former it may be lost in consequence of drunkenness or melancholy;
the latter takes it to be inalienable owing to the certainty of our mental apprehension. And virtue in itself they hold to be worthy of choice for its own sake. At all events we are ashamed of bad conduct as if we knew that nothing is really good but the morally beautiful. Moreover, they hold that it is in itself sufficient to ensure well-being: thus Zeno, and Chrysippus in the first book of his treatise On Virtues, and Hecato in the second book of his treatise On Goods:
For if magnanimity by itself alone can raise us far above everything, and if magnanimity is but a part of virtue, then too virtue as a whole will be sufficient in itself for well-being —despising all things that seem troublesome. Panaetius, however, and Posidonius deny that virtue is self-sufficing: on the contrary, health is necessary, and some means of living and strength.
Another tenet of theirs is the perpetual exercise of virtue, as held by Cleanthes and his followers. For virtue can never be lost, and the good man is always exercising his mind, which is perfect. Again, they say that justice, as well as law and right reason, exists by nature and not by convention: so Chrysippus in his work On the Morally Beautiful.
Neither do they think that the divergence of opinion between philosophers is any reason for abandoning the study of philosophy, since at that rate we should have to give up life altogether: so Posidonius in his Exhortations. Chrysippus allows that the ordinary Greek education is serviceable.
It is their doctrine that there can be no question of right as between man and the lower animals, because of their unlikeness. Thus Chrysippus in the first book of his treatise On Justice, and Posidonius
Their definition of love is an effort toward friendliness due to visible beauty appearing, its sole end being friendship, not bodily enjoyment. At all events, they allege that Thrasonides, although he had his mistress in his power, abstained from her because she hated him. By which it is shown, they think, that love depends upon regard, as Chrysippus says in his treatise Of Love, and is not sent by the gods. And beauty they describe as the bloom or flower of virtue.
Of the three kinds of life, the contemplative, the practical, and the rational, they declare that we ought to choose the last, for that a rational being is expressly produced by nature for contemplation and for action. They tell us that the wise man will for reasonable cause make his own exit from life, on his country’s behalf or for the sake of his friends, or if he suffer intolerable pain, mutilation, or incurable disease.
It is also their doctrine that amongst the wise there should be a community of wives with free choice of partners, as Zeno says in his Republic and Chrysippus in his treatise On Government [and not only they, but also Diogenes the Cynic and Plato].[*](The words in brackets read like a marginal note, afterwards inserted in the text.) Under such circumstances we shall feel paternal affection for all the children alike, and there will be an end of the jealousies arising from adultery. The best form of government they hold to be a mixture
Such, then, are the statements they make in their ethical doctrines, with much more besides, together with their proper proofs: let this, however, suffice for a statement of them in a summary and elementary form.