PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

From The Catechism of the Catholic Church

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.⁸

From The Catechism of the Catholic Church – rosary.team