The limits of human action…

"The only way in which one can increase one’s share of wealth on the market is by increasing one’s marginal productivity. … Economics cannot tell the ethician [sic] or the theologian what to do and what not to do. All it can do is to set forth the limits of the possibility of human action. If good intentions are to bear good fruit, they must take account of these limitations."

James A. Sadowsky "The Christian Response to Poverty"