M. Tullius Cicero, De Officiis
Walter Miller, Ed.

[38] 9. By way of illustrating this truth Plato introduces ¹ the familiar story of Gyges: Once upon a time the earth opened in consequence of heavy rains; Gyges went down into the chasm and saw, so the story goes, a horse of bronze; in its side was a door. On opening this door he saw the body of a dead man of enormous size with a gold ring upon his finger. He removed this and put it on his own hand and then repaired to an assembly of the shepherds, for he was a shepherd of the king. As often as he turned the bezel of the ring inwards toward the palm of his hand, he became invisible to everyone, while lie himself saw everything; but as often as he turned [p. 307] it back to its proper position, he became visible again. And so, with the advantage which the ring gave him, he debauched the queen, and with her assistance he murdered his royal master and removed all those who he thought stood in his way, without anyone's being able to detect him in his crimes. Thus, by virtue of the ring, he shortly rose to be king of Lydia.

Now, suppose a wise man had just such a ring, he would not imagine that he was free to do wrong any more than if he did not have it; for good men aim to secure not secrecy but the right.