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Creed › … › Paragraph 4. Christ's Faithful - Hierarchy, Laity, Consecrated Life
Why the ecclesial ministry?
Sacramental ministry in the Church, then, is at once a collegial and a personal service, exercised in the name of Christ. This is evidenced by the bonds between the episcopal college and its head, the successor of St. Peter, and in the relationship between the bishop's pastoral responsibility for his particular church and the common solicitude of the episcopal college for the universal Church.
Source: Catechism of the Catholic Church (Vatican.va)