This passage from Sacrosanctum Concilium, the Constitution on the Sacred Liturgy, includes some of the most influential ideas of the document. The liturgy is “source and summit” of the Church’s activity. The faithful are called to active participation in the rites of the Church.

    The liturgy is the summit toward which the activity of the Church is directed; at the same time it is the font from which all her power flows. For the aim and object of apostolic works is that all who are made sons of God by faith and baptism should come together to praise God in the midst of His Church, to take part in the sacrifice, and to eat the Lord's supper.

    The liturgy in its turn moves the faithful, filled with "the paschal sacraments," to be "one in holiness"; it prays that "they may hold fast in their lives to what they have grasped by their faith"; the renewal in the eucharist of the covenant between the Lord and man draws the faithful into the compelling love of Christ and sets them on fire. From the liturgy, therefore, and especially from the eucharist, as from a font, grace is poured forth upon us; and the sanctification of men in Christ and the glorification of God, to which all other activities of the Church are directed as toward their end, is achieved in the most efficacious possible way.

    But in order that the liturgy may be able to produce its full effects, it is necessary that the faithful come to it with proper dispositions, that their minds should be attuned to their voices, and that they should cooperate with divine grace lest they receive it in vain. Pastors of souls must therefore realize that, when the liturgy is celebrated, something more is required than the mere observation of the laws governing valid and licit celebration; it is their duty also to ensure that the faithful take part fully aware of what they are doing, actively engaged in the rite, and enriched by its effects.

Sacrosanctum Concilium, 10-12

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