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.
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CHAPTER II: THE PEOPLE OF GODThough 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. [2] 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. [3] They exercise that priesthood, too, by the reception of the sacraments, prayer and thanksgiving, the witness of a holy life, abnegation and active charity.
11. The sacred nature and organic structure of the priestly community is brought into operation through the sacraments and the exercise of virtues. Incorporated into the Church by Baptism, the faithful are appointed by their baptismal character to Christian religious worship; reborn as sons of God, they must profess before men the faith they have received from God through the Church. [4] By the sacrament of Confirmation they are more perfectly bound to the Church and are endowed with the special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread the faith by word and deed. [5] 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. [6] 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... Dogmatic Constitution on the Church (Lumen Gentium)