Just as Jesus Christ was sent by the Father, so also He sent the apostles. His purpose was that they might exercise the work of salvation ... by means of sacrifice and sacraments, around which the entire liturgical life revolves. Christ is always present in His Church, especially in her liturgical celebrations. Rightly, then, the liturgy is considered as an exercise of the priestly office of Jesus Christ. From this follows that every liturgical celebration ... is a sacred action, surpassing all others. In order that the sacred liturgy may produce its full effect, it is necessary that the faithful come to it with proper dispositions, that their thoughts match their words and that they cooperate with divine grace ...

Promotion of liturgical instruction and active participation (2 pages).

Mother Church earnestly desires that all the faithful be led to that full, conscious and active participation in the liturgical celebrations which is demanded by the very nature of the liturgy. Yet it would be futile to entertain any hopes of realizing this goal unless the pastors themselves, to begin with, become thoroughly penetrated with the spirit and power of the liturgy, and become masters of it. It is vitally necessary, therefore, that attention be directed…to the liturgical instruction of the clergy.