Christ instituted an ecclesiastical hierarchy with the mission of feeding the people of God in his name and for this purpose gave it authority. The hierarchy is formed of sacred ministers,; bishops, priests, and deacons. Thanks to the sacrament of Orders, bishops and priests act in the exercise of their ministry in the name and person of Christ the Head. Deacons minister to the people of God in the diakonia (service) of word, liturgy, and charity.
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After the example of the twelve Apostles who were chosen and sent out together by Christ, the unity of the Church’s hierarchy is at the service of the communion of all the faithful. Every bishop exercises his ministry as a member of the episcopal college in communion with the Pope and shares with him in the care of the universal Church. Priests exercise their ministry in the presbyterate of the local Church in communion with their own bishop and under his direction.
Ecclesial ministry also has a personal character in as much as each minister, in virtue of the sacrament of Holy Orders, is responsible before Christ who called him personally and conferred on him his mission.
The Pope, Bishop of Rome and the Successor of Saint Peter, is the perpetual, visible source and foundation of the unity of the Church. He is the vicar of Christ, the head of the College of bishops and pastor of the universal Church over which he has by divine institution full, supreme, immediate, and universal power.
The college of bishops in union with the Pope, and never without him, also exercises supreme and full authority over the Church.
Since they are authentic witnesses of the apostolic faith and are invested with the authority of Christ, the bishops in union with the Pope have the duty of proclaiming the Gospel faithfully and authoritatively to all. By means of a supernatural sense of faith, the people of God unfailingly adhere to the faith under the guidance of the living Magisterium of the Church.
Infallibility is exercised when the Roman Pontiff, in virtue of his office as the Supreme Pastor of the Church, or the College of Bishops, in union with the Pope especially when joined together in an Ecumenical Council, proclaim by a definitive act a doctrine pertaining to faith or morals. Infallibility is also exercised when the Pope and Bishops in their ordinary Magisterium are in agreement in proposing a doctrine as definitive. Every one of the faithful must adhere to such teaching with the obedience of faith.