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. "God saw that all He had made was very good" (Gen. 1:31). This natural goodness of theirs takes on a special dignity as a result of their relation to the human person, for whose service they were created. It has pleased God to unite all things, both natural and supernatural, in Christ Jesus "so that in all things He may have the first place" (Col. 1:18). This destination, however, not only does not deprive the temporal order of its independence, its proper goals, laws, supports, and significance for human welfare but rather perfects the temporal order in its own intrinsic strength and worth and puts it on a level with man's whole vocation upon earth. In the course of history, the use of temporal things has been marred by serious vices. Affected by original sin, men have frequently fallen into many errors concerning the true God, the nature of man, and the principles of the moral law. This has led to the corruption of morals and human institutions and not rarely to contempt for the human person himself. In our own time, moreover, those who have trusted excessively in the progress of the natural sciences and the technical arts have fallen into an idolatry of temporal things and have become their slaves rather than their masters. The whole Church must work vigorously in order that men may become capable of rectifying the distortion of the temporal order and directing it to God through Christ. Pastors must clearly state the principles concerning the purpose of creation and the use of temporal things and must offer the moral and spiritual aids by which the temporal order may be renewed in Christ. The laity must take up the renewal of the temporal order as their own special obligation. Led by the light of the Gospel and the mind of the Church and motivated by Christian charity, they must act directly and in a definite way in the temporal sphere. As citizens they must cooperate with other citizens with their own particular skill and on their own responsibility. 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.
Source: Apostolicam Actuositatem (Vatican.va)