— Zeno of CitiumStoic doctrine attributed to Zeno, reported in Cicero, Tusculan Disputations 5 and in Diogenes Laertius 7.127; approximate English rendering
Commentary
This thesis, that virtue alone suffices for a happy life, is one of the defining claims of Stoic ethics and is reported as Zeno's doctrine in several ancient sources. The claim implies that external goods such as health, wealth, and reputation are not necessary for happiness, though they may be preferred indifferents. A. A. Long and D. N. Sedley, in The Hellenistic Philosophers, treat the thesis as a central test of Stoic consistency, and they show how Zeno's successors struggled to defend it against objections that virtue appeared insufficient in cases of misfortune. Brad Inwood argues in his study of early Stoicism that the doctrine rests on a rational analysis of the good, so that virtue, as the perfection of reason, cannot be diminished by external circumstances. Julia Annas notes that Cicero's reporting of the thesis is partly polemical, and that his account should be read with care. Malcolm Schofield's work on Stoic social thought observes that the sufficiency of virtue supports the Stoic ideal of the wise man, who is free and happy whatever his fortune. The English is an approximation of a Latin and Greek report, and the wording should be checked in the sources before quotation.
Commentary
This thesis, that virtue alone suffices for a happy life, is one of the defining claims of Stoic ethics and is reported as Zeno's doctrine in several ancient sources. The claim implies that external goods such as health, wealth, and reputation are not necessary for happiness, though they may be preferred indifferents. A. A. Long and D. N. Sedley, in The Hellenistic Philosophers, treat the thesis as a central test of Stoic consistency, and they show how Zeno's successors struggled to defend it against objections that virtue appeared insufficient in cases of misfortune. Brad Inwood argues in his study of early Stoicism that the doctrine rests on a rational analysis of the good, so that virtue, as the perfection of reason, cannot be diminished by external circumstances. Julia Annas notes that Cicero's reporting of the thesis is partly polemical, and that his account should be read with care. Malcolm Schofield's work on Stoic social thought observes that the sufficiency of virtue supports the Stoic ideal of the wise man, who is free and happy whatever his fortune. The English is an approximation of a Latin and Greek report, and the wording should be checked in the sources before quotation.