The Church adopted the term order from its use in the Roman Empire, where it referred to a governing group. In the Sacrament of Holy Orders, there are three degrees or “orders”: bishop, priest, and deacon. The rite of ordination is the sacramental act that makes this possible. Ordination “confers a gift of the Holy Spirit that permits the exercise of a ‘sacred power’ . . . which can come only from Christ himself through the Church” (CCC, no. 1538).
The first priest figure to appear in the Old Testament is Melchizedek, who offered a sacrifice of bread and wine on behalf of the patriarch Abraham (Gn 14:18-20). He symbolized the permanence of priesthood: “Like Melchizedek you are a priest forever” (Ps 110:4). God also chose Aaron and his sons to be priests (Ex 28:1ff.) and designated the tribe of Levi for liturgical service. They acted on behalf of the people and offered gifts and sacrifices for sins. They proclaimed God’s Word and led people to communion with him through sacrifices and prayers.
But these priests were unable to provide the fullness of salvation or definitive sanctification for the people. Only the sacrifice of Jesus Christ could bring this about. The priesthood of Melchizedek, Aaron, and the Levites prefigured the priesthood of Christ, as is seen in consecration prayers for the ordination of bishops, priests, and deacons.
The priesthood of the Old Testament found its perfect fulfillment in the priesthood of Jesus Christ, who is the one mediator between God and us. Jesus’ sacrifice of himself on the Cross was a priestly act of perfect self-offering accepted by the Father and culminating in his Resurrection from the dead so that, as Risen Lord and High Priest, he continues to offer salvation to all.
By Baptism, all the members of the Church share in Christ’s holy priesthood. It is called “the common priesthood of the faithful” because the entire Church shares in it. To build up this priesthood, Christ gives to his Church the ordained ministries of bishops, priests, and deacons through the Sacrament of Holy Orders. Only the ordained bishop and priest may be ministers of Confirmation (or Chrismation), the Eucharist, the Sacrament of Penance and Reconciliation, and the Sacrament of the Anointing of the Sick. Only bishops may ordain deacons, priests, and other bishops. “The ministerial priesthood differs in essence from the common priesthood of the faithful because it confers a sacred power for the service of the faithful. The ordained ministers exercise their service for the People of God by teaching (munus docendi), divine worship (munus liturgicum) and pastoral governance (munus regendi)” (CCC, no. 1592). Deacons in the Latin Church can baptize and witness the Sacrament of Marriage, as do priests and bishops.
The ordained bishop and priest serve the Church in the person of Christ as head of the Body. “Through the ordained ministry, especially that of bishops and priests, the presence of Christ as head of the Church is made visible in the midst of the community of believers” (CCC, no. 1549). The Sacrament does not preserve the ordained from weakness and sin, but the Holy Spirit guarantees that the minister’s sin does not impede the effectiveness of the Sacrament and its graces. The ordained are called to a holiness of life and an attitude of humility that conforms them to Christ whose priesthood they share. The priest acts not only in the person of Christ, the Head of the Church, but also in the name of the Church when presenting to God the prayer of the Church, especially in the Eucharist.
You can read more from the United States Catholic Catechism for Adults, order your own copy, or read questions about it at the United States Conference of Catholic Bishops website.
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