The diocesan Bishop is the chief teacher, sanctifier, and shepherd of God's people. Most Bishops are given a diocese to govern spiritually, making sure the priests, deacons, pastoral workers and catechists in their diocese are preaching the Gospel and teaching sound doctrine to the flock. He is the principal teacher. The Bishop is the primary dispenser of all the sacraments. He has oversight of the liturgy.
He possesses the fullness of Orders, so that the fullness of Christ's grace can flow through in sacramental form, to the sanctification of the faithful. Through his relationships with the priests of his diocese, the Bishop is able to shepherd the people of his diocese. The Bishops have been given a special outpouring of grace, to continue the work that the Apostles started.