The Republic by Plato Part 1 Page 20

But is the just man or the skilful player a more useful and better partner at a game of draughts?

The skilful player.

And in the laying of bricks and stones is the just man a more useful or better partner than the builder?

Quite the reverse.

Then in what sort of partnership is the just man a better partner than the harp-player, as in playing the harp the harp-player is certainly a better partner than the just man?

In a money partnership.

Yes, Polemarchus, but surely not in the use of money; for you do not want a just man to be your counsellor in the purchase or sale of a horse; a man who is knowing about horses would be better for that, would he not?