Noticing that, he made a trail of the ring, to see if it…

““Noticing that, he made a trail of the ring, to see if it had that power; and he found that whenever he turned the collet inside, he was invisible, when he turned it outside, visible. After he found this out he managed to be appointed one of the messengers to the king; when he got there, he seduced the king's wife, and with her set upon the king, and killed him, and seized the empire. Then if there could be two such rings, and if the just man put one on and the unjust the other, no one, as it would be thought, would be so adamantine as to abide in the practice of justice, no one could endure to hold back from another's goods and not to touch, when it was in his power to take what he would even out of the market without fear, and to go into any house and lie with anyone he wished, and to kill or set free from prison those he might wish, and to do anything else in the world like a very god. And in doing so he would do just the same as the other; both would go the same way. Surely one would call this a strong proof that no one is just willingly but only under a strong compulsion, believing that it is not a good to him personally; since wherever each thinks he will be able to do injustice, he does injustice.””

— Plato