II. How is the Liturgy Celebrated?

From The Catechism of the Catholic Church

Following the divinely
inspired teaching of our holy Fathers and the tradition of the Catholic Church
(for we know that this tradition comes from the Holy Spirit who dwells in her)
we rightly define with full certainty and correctness that, like the figure of
the precious and life-giving cross, venerable and holy images of our Lord and
God and Savior, Jesus Christ, our inviolate Lady, the holy Mother of God, and
the venerated angels, all the saints and the just, whether painted or made of
mosaic or another suitable material, are to be exhibited in the holy churches
of God, on sacred vessels and vestments, walls and panels, in houses and on
streets.³¹

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION ONE THE SACRAMENTAL ECONOMY
- CHAPTER TWO THE SACRAMENTAL CELEBRATION OF THE PASCHAL MYSTERY
  - Article 1 CELEBRATING THE CHURCH’S LITURGY
    - II. How is the Liturgy Celebrated?

From The Catechism of the Catholic Church – rosary.team