The moral that Plato wished to draw out is that no man can resist the temptation of being able to steal and kill at will. All men are corruptible. Morality is a social construct imposed from the outside. A man may appear to be moral in public to maintain his reputation for integrity and honesty, but once he possesses the power of invisibility, the use of such power would be irresistible. (Some believe that this morality tale was the inspiration for J. R. R. Tolkien's Lord of the Rings trilogy, in which a ring that grants the wearer invisibility is also a source of evil.)