III. When is the Liturgy Celebrated?

From The Catechism of the Catholic Church

When we ponder, O Christ, the
marvels accomplished on this day, the Sunday of your holy resurrection, we say:
“Blessed is Sunday, for on it began creation . . . the world’s salvation
… the renewal of the human race …. On Sunday heaven and earth rejoiced and
the whole universe was filled with light. Blessed is Sunday, for on it were
opened the gates of paradise so that Adam and all the exiles might enter it
without fear.⁴¹

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
    - III. When is the Liturgy Celebrated?

From The Catechism of the Catholic Church – rosary.team