VATICAN II a…true apostle looks for opportunities to announce Christ by words addressed either to non-believers with a view to leading them to faith, or to the faithful with a view to instructing, strengthening, and encouraging them to a more fervent life. “For the charity of Christ impels us” (2 Cor. 5:14). The words of the Apostle should echo in all hearts, “Woe to me if I do not preach the Gospel” (1 Cor. 9:16).(1)
Since, in our own times, new problems are arising and very serious errors are circulating which tend to undermine the foundations of religion, the moral order, and human society itself, this sacred synod earnestly exhorts laymen-each according to his own gifts of intelligence and learning-to be more diligent in doing what they can to explain, defend, and properly apply Christian principles to the problems of our era in accordance with the mind of the Church.
7 God’s plan for the world is that men should work together to renew and constantly perfect the temporal order.
All those things which make up the temporal order, namely, the good things of life and the prosperity of the family, culture, economic matters, the arts and professions, the laws of the political community, international relations, and other matters of this kind, as well as their development and progress, not only aid in the attainment of man’s ultimate goal but also possess their own intrinsic value. This value has been established in them by God, whether they are considered in themselves or as parts of the whole temporal order. . . .
. . . Everywhere and in all things they must seek the justice of God’s kingdom. The temporal order must be renewed in such a way that, without detriment to its own proper laws, it may be brought into conformity with the higher principles of the Christian life and adapted to the shifting circumstances of time, place, and peoples. Preeminent among the works of this type of apostolate is that of Christian social action which the sacred synod desires to see extended to the whole temporal sphere, including culture.(2)