The liturgy is the summit toward which the activity of the church is directed; at the same time it is the fount from which all the Church's power flows.– Constitution on the Sacred Liturgy, #10
Mother Church earnestly desires that all the faithful should be led to that full, conscious, and active participation in liturgical celebrations which is demanded by the very nature of the liturgy. Such participation by the Christian people as "a chosen race, a royal priesthood, a holy nation, a redeemed people (1 Pt 2:9; cf. 2:4-5), is their right and duty by reason of their baptism.
– Constitution on the Sacred Liturgy, #14
The liturgy is the celebration of the mystery of Christ and in particular his paschal mystery. Through the exercise of the priestly office of Jesus Christ, the liturgy manifests in signs and brings about the sanctification of humankind. The public worship which is due to God is offered by the Mystical Body of Christ, that is, by its head and by its members.
– Compendium of the Catechism of the Catholic Church, Q. 218