THE SACRED LITURGY OF THE CHURCH
The sacred liturgy does not exhaust the entire activity of the Church. Before men can come to the liturgy they must be called to faith and to conversion: "How then are they to call upon him in whom they have not yet believed? But how are they to believe him whom they have not heard? And how are they to hear if no one preaches? And how are men to preach unless they be sent?" (Rom. 10:14-15).
Therefore the Church announces the good tidings of salvation to those who do not believe, so that all men may know the true God and Jesus Christ whom He has sent, and may be converted from their ways, doing penance. To believers also the Church must ever preach faith and penance, she must prepare them for the sacraments, teach them to observe all that Christ has commanded, and invite them to all the works of charity, piety, and the apostolate. For all these works make it clear that Christ's faithful, though not of this world, are to be the light of the world and to glorify the Father before men.
For the Church, evangelizing means bringing the Good News into all the strata of humanity, and through its influence transforming humanity from within and making it new: "Now I am making the whole of creation new." But there is no new humanity if there are not first of all new persons renewed by Baptism and by lives lived according to the Gospel. The purpose of evangelization is therefore precisely this interior change, and if it had to be expressed in one sentence the best way of stating it would be to say that the Church evangelizes when she seeks to convert, solely through the divine power of the message she proclaims, both the personal and collective consciences of people, the activities in which they engage, and the lives and concrete milieu which are theirs.
Strata of humanity which are transformed: for the Church it is a question not only of preaching the Gospel in ever wider geographic areas or to ever greater numbers of people, but also of affecting and as it were upsetting, through the power of the Gospel, mankind's criteria of judgment, determining values, points of interest, lines of thought, sources of inspiration and models of life, which are in contrast with the Word of God and the plan of salvation.
The mission of the Church pertains to the salvation of men, which is to be achieved by belief in Christ and by His grace. The apostolate of the Church and of all its members is primarily designed to manifest Christ's message by words and deeds and to communicate His grace to the world. This is done mainly through the ministry of the Word and the sacraments, entrusted in a special way to the clergy, wherein the laity also have their very important roles to fulfill if they are to be "fellow workers for the truth" (3 John 8). It is especially on this level that the apostolate of the laity and the pastoral ministry are mutually complementary.
There are innumerable opportunities open to the laity for the exercise of their apostolate of evangelization and sanctification. The very testimony of their Christian life and good works done in a supernatural spirit have the power to draw men to belief and to God; for the Lord says, "Even so let your light shine before men in order that they may see your good works and give glory to your Father who is in heaven" (Matt. 5:16).
However, an apostolate of this kind does not consist only in the witness of one's way of life; 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).
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.
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.
ln her very early days, the holy Church added the agape to the eucharistic supper and thus showed itself to be wholly united around Christ by the bond of charity. So, too, in every era it is recognized by this sign of love, and while it rejoices in the undertakings of others, it claims works of charity as its own inalienable duty and right. For this reason, pity for the needy and the sick and works of charity and mutual aid intended to relieve human needs of every kind are held in highest honor by the Church.
At the present time, with the development of more rapid facilities for communication, with the barrier of distance separating men greatly reduced, with the inhabitants of the entire globe becoming one great family, these charitable activities and works have become more urgent and universal. These charitable enterprises can and should reach out to all persons and all needs. Wherever there are people in need of food and drink, clothing, housing, medicine, employment, education; wherever men lack the facilities necessary for living a truly human life or are afflicted with serious distress or illness or suffer exile or imprisonment, there Christian charity should seek them out and find them, console them with great solicitude, and help them with appropriate relief. This obligation is imposed above all upon every prosperous nation and person.
In order that the exercise of charity on this scale may be unexceptionable in appearance as well as in fact, it is altogether necessary that one should consider in one's neighbor the image of God in which he has been created, and also Christ the Lord to Whom is really offered whatever is given to a needy person. It is imperative also that the freedom and dignity of the person being helped be respected with the utmost consideration, that the purity of one's charitable intentions be not stained by seeking one's own advantage or by striving for domination, and especially that the demands of justice be satisfied lest the giving of what is due in justice be represented as the offering of a charitable gift. Not only the effects but also the causes of these ills must be removed and the help be given in such a way that the recipients may gradually be freed from dependence on outsiders and become self-sufficient.
Therefore, the laity should hold in high esteem and, according to their ability, aid the works of charity and projects for social assistance, whether public or private, including international programs whereby effective help is given to needy individuals and peoples. In so doing, they should cooperate with all men of good will.
Culled from - http://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_const_19631204_sacrosanctum-concilium_en.html