Catechism of the Catholic Church

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. 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." 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." The People of God fulfills its royal dignity by a life in keeping with its vocation to serve with Christ. (2449, 2443) > 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?