" In the measure in which they participate in the office of the apostles, God gives priests a special grace to be ministers of Christ among the people. They perform the sacred duty of preaching the Gospel, so that the offering of the people can be made acceptable and sanctified by the Holy Spirit. Through the apostolic proclamation of the Gospel, the People of God are called together and assembled. All belonging to this people, since they have been sanctified by the Holy Spirit, can offer themselves as “a sacrifice, living, holy, pleasing to God” (Rom 12:1). Through the ministry of the priests, the spiritual sacrifice of the faithful is made perfect in union with the sacrifice of Christ. He is the only mediator who in the name of the whole Church is offered sacramentally in the Eucharist and in an unbloody manner until the Lord himself comes. The ministry of priests is directed to this goal and is perfected in it. Their ministry, which begins with the evangelical proclamation, derives its power and force from the sacrifice of Christ. Its aim is that “the entire commonwealth of the redeemed and the society of the saints be offered to God through the High Priest who offered himself also for us in his passion that we might be the body of so great a Head.” "
from Presbyterorum Ordinis , the Decree on the Ministry and Life of Priests
from Presbyterorum Ordinis , the Decree on the Ministry and Life of Priests