The Republic by Plato Part 10 Page 58

fulfilled the conditions of the argument; we have not introduced the rewards and glories of justice, which, as you were saying, are to be found in Homer and Hesiod; but justice in her own nature has been shown to be best for the soul in her own nature. Let a man do what is just, whether he have the ring of Gyges or not, and even if in addition to the ring of Gyges he put on the helmet of Hades.

Very true.

And now, Glaucon, there will be no harm in further enumerating how many and how great are the rewards which justice and the other virtues procure to the soul from gods and men, both in life and after death.

Certainly not, he said.

Will you repay me, then, what you borrowed in the argument?