131 We, made Shepherd and Protector by the Prince of Shepherds, Who Redeemed them by His Blood, of a truly innumerable flock, cannot hold back Our tears when contemplating this greatest of their dangers. Nay rather, fully mindful of Our pastoral office and with paternal solicitude, We are continually meditating on how We can help them; and We have summoned to Our aid the untiring zeal of others who are concerned on grounds of justice or charity. For what will it profit men to become expert in more wisely using their wealth, even to gaining the whole world, if thereby they suffer the loss of their souls? What will it profit to teach them sound principles of economic life if in unbridled and sordid greed they let themselves be swept away by their passion for property, so that "hearing the commandments of the Lord they do all things contrary."
Source: Quadragesimo Anno (Vatican.va)