§ 1076 The Church was made manifest to the world on the day of Pentecost by the outpouring of the Holy Spirit. The gift of the Spirit ushers in a new era in the “dispensation of the mystery” the age of the Church, during which Christ manifests, makes present, and communicates his work of salvation through the liturgy of his Church, “until he comes.” In this age of the Church Christ now lives and acts in and with his Church, in a new way appropriate to this new age. He acts through the sacraments in what the common Tradition of the East and the West calls “the sacramental economy’; this is the communication (or “dispensation”) of the fruits of Christ’s Paschal mystery in the celebration of the Church’s “sacramental” liturgy.
§ 1096 Jewish liturgy and Christian liturgy. A better knowledge of the Jewish people’s faith and religious life as professed and lived even now can help our better understanding of certain aspects of Christian liturgy. For both Jews and Christians Sacred Scripture is an essential part of their respective liturgies: in the proclamation of the Word of God, the response to this word, prayer of praise and intercession for the living and the dead, invocation of God’s mercy. In its characteristic structure the Liturgy of the Word originates in Jewish prayer. the Liturgy of the Hours and other liturgical texts and formularies, as well as those of our most venerable prayers, including the Lord’s Prayer, have parallels in Jewish prayer. the Eucharistic Prayers also draw their inspiration from the Jewish tradition. the relationship between Jewish liturgy and Christian liturgy, but also their differences in content, are particularly evident in the great feasts of the liturgical year, such as Passover. Christians and Jews both celebrate the Passover. For Jews, it is the Passover of history, tending toward the future; for Christians, it is the Passover fulfilled in the death and Resurrection of Christ, though always in expectation of its definitive consummation.
§ 1140 It is the whole community, the Body of Christ united with its Head, that celebrates. Liturgical services are not private functions but are celebrations of the Church which is ‘the sacrament of unity,’ namely, the holy people united and organized under the authority of the bishops. Therefore, liturgical services pertain to the whole Body of the Church. They manifest it, and have effects upon it. But they touch individual members of the Church in different ways, depending on their orders, their role in the liturgical services, and their actual participation in them.”7 For this reason, rites which are meant to be celebrated in common, with the faithful present and actively participating, should as far as possible be celebrated in that way rather than by an individual and quasi-privately.
While we generally associate liturgy with the Holy Sacrifice of the Mass, it is more than that. For example, the Divine Office is a liturgy of the Church.