CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 1070–1073

1070 In the New Testament the word "liturgy" refers not only to the celebration of divine worship but also to the proclamation of the Gospel and to active charity. In all of these situations it is a question of the service of God and neighbor. In a liturgical celebration the Church is servant in the image of her Lord, the one "leitourgos"; she shares in Christ's priesthood (worship), which is both prophetic (proclamation) and kingly (service of charity):

The liturgy then is rightly seen as an exercise of the priestly office of Jesus Christ. It involves the presentation of man's sanctification under the guise of signs perceptible by the senses and its accomplishment in ways appropriate to each of these signs. In it full public worship is performed by the Mystical Body of Jesus Christ, that is, by the Head and his members. From this it follows that every liturgical celebration, because it is an action of Christ the priest and of his Body which is the Church, is a sacred action surpassing all others. No other action of the Church can equal its efficacy by the same title and to the same degree

1071 As the work of Christ liturgy is also an action of his Church. It makes the Church present and manifests her as the visible sign of the communion in Christ between God and men. It engages the faithful in the new life of the community and involves the "conscious, active, and fruitful participation" of everyone.
1072 "The sacred liturgy does not exhaust the entire activity of the Church": it must be preceded by evangelization, faith, and conversion. It can then produce its fruits in the lives of the faithful: new life in the Spirit, involvement in the mission of the Church, and service to her unity.
1073 The liturgy is also a participation in Christ's own prayer addressed to the Father in the Holy Spirit. In the liturgy, all Christian prayer finds its source and goal. Through the liturgy the inner man is rooted and grounded in "the great love with which [the Father] loved us" in his beloved Son. It is the same "marvelous work of God" that is lived and internalized by all prayer, "at all times in the Spirit."
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