Because the church as a whole people was given the graces necessary for salvation, it is proper that the church as a people join Christ in the liturgy in his priestly role of giving honor and praise to God.
Liturgy was always used to refer to an organized community. A liturgy was a work done by an individual or a group on behest of the larger community. Every worshiper is expected to actively participate in each liturgy, because this is holy "work," not amusement or an observer event. Every liturgical celebration is a manifestation of Christ the High Priest and his Mystical Body, the Church. As a result, the involvement of the People of God in God's work is required.
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