Gyge's Ring And Plato's View Of A Just Individual

In the second publication of Plato's Republic, Glaucon notifies the article of Gyges the Lydian, who one day found out, rather by likelihood, a ring that could make him unseen when he turned it one way on his digit and evident afresh when he turned it the other (359c-360b). Gyges' vocation regularly impersonates certain ethical adversities, which Glaucon proceeds on to elaborate. Suppose, he inquires, that other persons could make themselves invisible: (Adam & Rees 127)

No one could be found out, it would emerge, of such adamantine temper as to persevere in fairness ...