Liturgy is a going out of being closed in on ourselves...
The Holy Father, in the General Audience (October 3, 2012), gave a catechism on the Ecclesial Nature of Liturgical Prayer. The highlights would be the following:
"In the Catechism of the Catholic Church we read: “In the liturgy of the New Covenant every liturgical action, especially the celebration of the Eucharist and the sacraments, is an encounter between Christ and the Church” (n. 1097); therefore, it is the “whole Christ”, the whole Community, the Body of Christ united with her Head who celebrates. The liturgy then is not a kind of “self-manifestation” of a community; instead, it is a going out of simply “being ourselves” -- of being closed in on ourselves -- and the portal to the great banquet, the entrance into the great living community, in which God himself nourishes us. The liturgy involves universality, and this universal character must enter ever anew into everyone’s awareness. The Christian liturgy is the worship of the universal temple, which is the Risen Christ. His arms are extended on the Cross in order to draw all men into the embrace of God’s eternal love. It is the worship of heaven opened wide. It is never merely the event of a single community, with its own position in time and space. It is important that every Christian feel and really be inserted into this universal “we”, which provides the foundation and refuge for the “I” in the Body of the Christ, which is the Church.
"In this, we must always be mindful of and accept the logic of the Incarnation of God: He has drawn close, become present, by entering into history and into human nature, by becoming one of us. And this presence continues in the Church, his Body. The liturgy then is not the memory of past events, but rather the living presence of Christ’s Paschal Mystery, which transcends and unites both time and space. If the centrality of Christ does not emerge at the forefront in the celebration, we will not have Christian liturgy, which is totally dependent upon the Lord and sustained by his creative presence. God acts by means of Christ and we cannot act except through him and in him. Every day, the conviction must grow in us that the liturgy is not ours, my own “doing”; rather, it is God’s action in us and with us.
"Therefore, it is neither the individual – priest or faithful – nor the group who celebrates the liturgy; rather, it is primarily God’s action through the Church, who has her own history, her own rich tradition and her own creativity. This universality and fundamental openness, which is proper to the liturgy as a whole, is one of the reasons why it cannot be designed or modified by individual communities or by experts, but must be faithful to the forms of the universal Church.
Even in the liturgy of the smallest communities, the entire Church is always present. For this reason, there are no “strangers” in the liturgical community. In every liturgical celebration the whole Church participates together, heaven and earth, God and men. The Christian liturgy, although it is celebrated in a concrete place and space and expresses the “yes” of a particular community, is by its very nature catholic; it comes from the whole and leads to the whole, in unity with the Pope, with the Bishops, with believers of all times and ages and from all places. The more a celebration is animated by this awareness, the more fruitfully will the authentic meaning of the liturgy there be realized.
"Dear friends, the Church is made visible in many ways: in charitable works, in missionary endeavors, in the personal apostolate that every Christian should carry out in his own environment. But the place where she is fully experienced as the Church is in the liturgy: it is the act, we believe, whereby God enters into our reality and we can encounter him, we can touch him. It is the act whereby we enter into contact with God: He comes to us, and we are enlightened by him. Therefore, when in our reflections we focus our attention only on how we may render it attractive, interesting, beautiful, we risk forgetting the essential: the liturgy is celebrated for God and not for us; it is his work; he is the subject; and we should open ourselves to him and allow ourselves to be guided by him and by his Body, which is the Church."The Link: ZENIT - On the Ecclesial Nature of Liturgical Prayer