Liturgy: changeable or not?

Read the Catechism in a Year

Catechism in a Year: Day 168

Part Two: How We Celebrate the Christian Mysteries
- Section One: God Acts in Our Regard by Means of Sacred Signs
-- Chapter Two: How We Celebrate the Mysteries of Christ
Question 192: Can the Church also change and renew the liturgy?

There are changeable and unchangeable components of the liturgy. Unchangeable is everything that is of divine origin, for instance, the words of Jesus at the Last Supper. Then there are changeable parts, which the Church occasionally must change. After all, the mystery of Christ must be proclaimed, celebrated, and lived out at all times and in all places.

Jesus effectively addressed the entire person: mind and understanding, heart and will. That is precisely what he wants to do today also in the liturgy. That is why it has different characteristics in Africa and in Europe, in nursing homes and at World Youth Days, and differs in appearance in parishes and monasteries. But it must still be recognizable that it is the one liturgy of the whole worldwide Church.

Dig Deeper: Corresponding CCC section (1189-1209) and other references here.
Recommended Listening for Easter Sunday: Trust in the Lord by Fr. Thomas Ricter