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The apostolate of the laity derives from their Christian vocation and the Church can never be without it. Sacred Scripture clearly shows how spontaneous and fruitful such activity was at the very beginning of the Church (cf. Acts 11:19-21; 18:26; Rom. 16:1-16; Phil. 4:3).

In the Church there is a diversity of ministry but a oneness of mission. Christ conferred on the Apostles and their successors the duty of teaching, sanctifying, and ruling in His name and power. But the laity likewise share in the priestly, prophetic, and royal office of Christ and therefore have their own share in the mission of the whole people of God in the Church and in the world.(2)

They exercise the apostolate in fact by their activity directed to the evangelization and sanctification of men and to the penetrating and perfecting of the temporal order through the spirit of the Gospel. In this way, their temporal activity openly bears witness to Christ and promotes the salvation of men. Since the laity, in accordance with their state of life, live in the midst of the world and its concerns, they are called by God to exercise their apostolate in the world like leaven, with the ardor of the spirit of Christ

The laity derive the right and duty to the apostolate from their union with Christ the head; incorporated into Christ’s Mystical Body through Baptism and strengthened by the power of the Holy Spirit through Confirmation, they are assigned to the apostolate by the Lord Himself. They are consecrated for the royal priesthood and the holy people (cf. 1 Peter 2:4-10) not only that they may offer spiritual sacrifices in everything they do but also that they may witness to Christ throughout the world. The sacraments, however, especially the most holy Eucharist, communicate and nourish that charity which is the soul of the entire apostolate.(3)

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).
(cf. Decree on the Apostolate of the Laity APOSTOLICAM ACTUOSITATEM
Solemnly Promulgated by His Holiness, Pope Paul VI on November 18, 1965: Preface, Chapters I & II)

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