“Lumen Gentium” on the eucharistic sacrifice
“As often as the sacrifice of the cross by which “Christ our Pasch is sacrificed” (1 Cor. 5:7) is celebrated on the altar, the work of our redemption is carried out ….”
Though they differ essentially and not only in degree, the common priesthood of the faithful and the ministerial or hierarchical priesthood are none the less ordered one to another; each in its own proper way shares in the one priesthood of Christ. The ministerial priest, by the sacred power that he has, forms and rules the priestly people; in the person of Christ he effects the Eucharistic sacrifice and offers it to God in the name of all the people. The faithful indeed, by virtue of their royal priesthood, participate in the offering of the Eucharist…. Taking part in the Eucharistic sacrifice, the source and summit of the Christian life, they offer the divine victim to God and themselves along with it. And so it is that, both in the offering and in Holy Communion, each in his own way, though not of course indiscriminately, has his own part to play in the liturgical action. Then, strengthened by the body of Christ in the Eucharistic communion, they manifest in a concrete way that unity of the People of God which this holy sacrament aptly signifies and admirably realizes.