34 In teaching this enlightening doctrine the Church has no other intention than to realize the glad tidings sung by the Angels above the cave of Bethlehem at the Redeemer's birth: "Glory to God . . . and . . . peace to men . . .," true peace and true happiness, even here below as far as is possible, in preparation for the happiness of heaven - but to men of good will. This doctrine is equally removed from all extremes of error and all exaggerations of parties or systems which stem from error. It maintains a constant equilibrium of truth and justice, which it vindicates in theory and applies and promotes in practice, bringing into harmony the rights and duties of all parties. Thus authority is reconciled with liberty, the dignity of the individual with that of the State, the human personality of the subject with the divine delegation of the superior; and in this way a balance is struck between the due dependence and well-ordered love of a man for himself, his family and country, and his love of other families and other peoples, founded on the love of God, the Father of all, their first principle and last end. The Church does not separate a proper regard for temporal welfare from solicitude for the eternal. If she subordinates the former to the latter according to the words of her divine Founder, "Seek ye first the Kingdom of God and His justice, and all these things shall be added unto you," she is nevertheless so far from being unconcerned with human affairs, so far from hindering civil progress and material advancement, that she actually fosters and promotes them in the most sensible and efficacious manner. Thus even in the sphere of social-economics, although the Church has never proposed a definite technical system, since this is not her field, she has nevertheless clearly outlined the guiding principles which, while susceptible of varied concrete applications according to the diversified conditions of times and places and peoples, indicate the safe way of securing the happy progress of society.
Source: Divini Redemptoris (Vatican.va)