49 Passing now to another aspect of the subject which is of no less importance, We wish to speak of social reforms demanded by justice and charity. Whilst the propaganda of communism, today so widespread, is readily deceiving the minds of the simple and untutored, We seem to hear an echo of those words of the Divine Saviour: "I have compassion on the multitude." It is imperative to put into practice with zeal and diligence the right principles taught by the Church in this matter. It is imperative to keep all nations free from those pernicious errors, or, in case they are already tainted with them, to set them free from these inimical doctrines which represent the enjoyment of this world as the unique goal to be attained by men in this mortal life. At the same time, by subjecting everything to state ownership and control, they reduce the dignity of the human person almost to zero. It is imperative to proclaim in private and in public that we are all exiles making our way to our immortal home; and are destined to eternal happiness, to which truth and virtue must lead us. Christ is the only real defender of human justice, the only true consoler of the human misery that in this life is unavoidable. He alone points out to us that haven of peace, justice, and everlasting happiness which all of us, redeemed by His blood, are to gain after our earthly pilgrimage is finished.
Source: Evangelii Praecones (Vatican.va)