18 Man's personal and collective fulfillment could be jeopardized if the proper scale of values were not maintained. The pursuit of life's necessities is quite legitimate; hence we are duty-bound to do the work which enables us to obtain them: "If anyone is unwilling to work, do not let him eat.'' (l6) But the acquisition of worldly goods can lead men to greed, to the unrelenting desire for more, to the pursuit of greater personal power. Rich and poor alike—be they individuals, families or nations—can fall prey to avarice and soulstifling materialism.
Source: Populorum Progressio (Vatican.va)