Note to the Nature of Wealth by John Ruskin

The object of Political Economy is not to buy, nor to sell labour, — but to spare it. Every attempt to buy or sell it is, in the outcome, ineffectual; — so far as successful, it is not sale, but Betrayal; and the purchase money is a part of that typical thirty pieces which bought, first the greatest of labours, and afterwards the burial field of the Stranger; for this purchase-money, being in its very smallness or vileness the exactly measured opposite of "vilis annona amicorum," makes all men strangers to each other.