21 Men today do not act as Christians, as brothers, but as strangers, and even enemies. The sense of man's personal dignity and of the value of human life has been lost in the brutal domination begotten of might and mere superiority in numbers. Many are intent on exploiting their neighbors solely for the purpose of enjoying more fully and on a larger scale the goods of this world. But they err grievously who have turned to the acquisition of material and temporal possessions and are forgetful of eternal and spiritual things, to the possession of which Jesus, Our Redeemer, by means of the Church, His living interpreter, calls mankind.
Source: Ubi Arcano Dei Consilio (Vatican.va)