Catechism of the Catholic Church

783 Jesus Christ is the one whom the Father anointed with the Holy Spirit and established as priest, prophet, and king. The whole People of God participates in these three offices of Christ and bears the responsibilities for mission and service that flow from them. ²⁰⁸

784 On entering the People of God through faith and Baptism, one receives a share in this people's unique, priestly vocation: "Christ the Lord, high priest taken from among men, has made this new people 'a kingdom of priests to God, his Father.' The baptized, by regeneration and the anointing of the Holy Spirit, are consecrated to be a spiritual house and a holy priesthood." ²⁰⁹

785 "The holy People of God shares also in Christ's prophetic office," above all in the supernatural sense of faith that belongs to the whole People, lay and clergy, when it "unfailingly adheres to this faith . . . once for all delivered to the saints," ²¹⁰ and when it deepens its understanding and becomes Christ's witness in the midst of this world.

786 Finally, the People of God shares in the royal office of Christ. He exercises his kingship by drawing all men to himself through his death and Resurrection. ²¹¹ Christ, King and Lord of the universe, made himself the servant of all, for he came "not to be served but to serve, and to give his life as a ransom for many." ²¹² For the Christian, "to reign is to serve him," particularly when serving "the poor and the suffering, in whom the Church recognizes the image of her poor and suffering founder." ²¹³ The People of God fulfills its royal dignity by a life in keeping with its vocation to serve with Christ.

The sign of the cross makes kings of all those reborn in Christ and the anointing of the Holy Spirit consecrates them as priests, so that, apart from the particular service of our ministry, all spiritual and rational Christians are recognized as members of this royal race and sharers in Christ's priestly office. What, indeed, is as royal for a soul as to govern the body in obedience to God? And what is as priestly as to dedicate a pure conscience to the Lord and to offer the spotless offerings of devotion on the altar of the heart? ²¹⁴