The Republic by Plato Part 2 Page 31

of them which makes the one to be a good and the other an evil to him. And please, as Glaucon requested of you, to exclude reputations; for unless you take away from each of them his true reputation and add on the false, we shall say that you do not praise justice, but the appearance of it; we shall think that you are only exhorting us to keep injustice dark, and that you really agree with Thrasymachus in thinking that justice is another’s good and the interest of the stronger, and that injustice is a man’s own profit and interest, though injurious to the weaker.

Now as you have admitted that justice is one of that highest class of goods which are desired indeed for their results, but in a far greater degree for their own sakes — like sight or hearing or knowledge or health, or any other real and natural