The Republic by Plato Part 1 Page 63

And each art gives us a particular good and not merely a general one — medicine, for example, gives us health; navigation, safety at sea, and so on?

Yes, he said.

And the art of payment has the special function of giving pay: but we do not confuse this with other arts, any more than the art of the pilot is to be confused with the art of medicine, because the health of the pilot may be improved by a sea voyage. You would not be inclined to say, would you, that navigation is the art of medicine, at least if we are to adopt your exact use of language?

Certainly not.

Or because a man is in good health when he receives pay you would not say that the art of payment is medicine?

I should not.