It is Church doctrine that the priesthood must strive to fulfill the grace given to them with the gift of the "laying on of hands" in the most perfect that they can. But the Church teaches that the reality and effectiveness of the sacraments of the Church, ministered by the presbyters, do not depend upon personal virtue, but upon the presence of Christ who acts in his Church by the Holy Spirit. The same as with bishops, it is Christ, through his chosen ministers, who acts as teacher, good shepherd, forgiver, and healer.