CCC 1205

"In the liturgy, above all that of the sacraments, there is an immutable part, a part that is divinely instituted and of which the Church is the guardian, and parts that can be changed, which the Church has the power and on occasion also the duty to adapt to the cultures of recently evangelized peoples."⁷³ John Paul II, Vicesimus quintus annus, 16; cf. SC 21.