From Scripture we learn that the Apostles appointed others by an external rite (imposition of hands), conferring inward grace. The fact that grace is ascribed immediately to the external rite, shows that Christ must have thus ordained. 

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With regard to the episcopate the Council of Trent defines that bishops belong to the divinely instituted hierarchy, that they are superior to priests, and that they have the power of confirming and ordaining which is proper to them.

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The first effect of the sacrament is an increase of sanctifying grace. With this, there is the sacramental grace which makes the recipient a fit and holy minister in the discharge of his office.

 

As the duties of God’s ministers are manifold and onerous, it is in perfect accord with the rulings of God’s Providence to confer a special grace on His ministers.