The Republic

by Plato

Yes.

Then, if there be any good which all artists have in common, that is to be attributed to something of which they all have the common use?

True, he replied.

And when the artist is benefited by receiving pay the advantage is gained by an additional use of the art of pay, which is not the art professed by him?

He gave a reluctant assent to this.

Then the pay is not derived by the several artists from their respective arts. But the truth is, that while the art of medicine gives health, and the art of the builder builds a house, another art attends them which is the art of pay. The various arts may be doing their own business and benefiting that over which they preside, but would the artist receive any benefit from his art unless he were paid as well?

I suppose not.

But does he therefore confer no benefit when he works for nothing?

Certainly, he confers a benefit.

Then now, Thrasymachus, there is no longer any doubt that neither arts nor governments provide for their own interests; but, as we were before saying, they rule and provide for the interests of their subjects who are the weaker and not the stronger—to their good they attend and not to the good of the superior.