In the Encyclical Mediator Dei, the Venerable Pius XII writes that "the Church is without question a living organism, and as an organism, in respect of the sacred liturgy also, she grows, matures, develops, adapts and accommodates herself to temporal needs and circumstances, provided only that the integrity of her doctrine be safeguarded" (no. 59).

In full accordance with this principle, the Second Vatican Council, in the Introduction to the Constitution Sacrosanctum Concilium (SC), recognizes "particularly cogent reasons for undertaking the reform and promotion of the liturgy" (no. 1). The Council assembly was gathered, in fact, with the desire to "impart an ever increasing vigour to the Christian life of the faithful; to adapt more suitably to the needs of our own times those institutions which are subject to change; to foster whatever can promote union among all who believe in Christ; to strengthen whatever can help to call the whole of mankind into the household of the Church" (ibid.).

The Council affirms the legitimacy of this progress, rooted in authentic Tradition, distinguishing within the liturgy "immutable elements, divinely instituted" from "elements subject to change [which] not only may but ought to be changed with the passage of time if they have suffered from the intrusion of anything out of harmony with the inner nature of the liturgy or have become unsuited to it" (SC, 21). Changes of this type have taken place constantly over the centuries in order to enable the faithful to participate fruitfully, through ritual actions, in the Paschal Mystery of Christ, the foundation of the Christian faith.

The Church's worship has thus been "embodied" in the cultural forms of each age and has been able to influence them and even transform them. The liturgy has thus been, for centuries, a driving force for evangelization. Today, this energy must be renewed in continuity with the authentic and living Catholic tradition, that is, in accordance with a dynamic aimed at introducing believers to the fullness of the truth.In the Encyclical Mediator Dei, the Venerable Pius XII writes that "the Church is without question a living organism, and as an organism, in respect of the sacred liturgy also, she grows, matures, develops, adapts and accommodates herself to temporal needs and circumstances, provided only that the integrity of her doctrine be safeguarded" (no. 59).

In full accordance with this principle, the Second Vatican Council, in the Introduction to the Constitution Sacrosanctum Concilium (SC), recognizes "particularly cogent reasons for undertaking the reform and promotion of the liturgy" (no. 1). The Council assembly was gathered, in fact, with the desire to "impart an ever increasing vigour to the Christian life of the faithful; to adapt more suitably to the needs of our own times those institutions which are subject to change; to foster whatever can promote union among all who believe in Christ; to strengthen whatever can help to call the whole of mankind into the household of the Church" (ibid.).

The Council affirms the legitimacy of this progress, rooted in authentic Tradition, distinguishing within the liturgy "immutable elements, divinely instituted" from "elements subject to change [which] not only may but ought to be changed with the passage of time if they have suffered from the intrusion of anything out of harmony with the inner nature of the liturgy or have become unsuited to it" (SC, 21). Changes of this type have taken place constantly over the centuries in order to enable the faithful to participate fruitfully, through ritual actions, in the Paschal Mystery of Christ, the foundation of the Christian faith.

The Church's worship has thus been "embodied" in the cultural forms of each age and has been able to influence them and even transform them. The liturgy has thus been, for centuries, a driving force for evangelization. Today, this energy must be renewed in continuity with the authentic and living Catholic tradition, that is, in accordance with a dynamic aimed at introducing believers to the fullness of the truth.

The Council Magisterium ... thus calls for the avoidance of confusion amongst the faithful, discouraging anyone from adding, removing, or altering anything in liturgical matters on their own initiative (cf. SC, 22). The progress evoked in the Conciliar Constitution in no way compromises ecclesial communion: rather, it seeks to confirm and foster it.

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