THE SACRAMENT OF HOLY ORDERS
1536 Holy Orders is the sacrament through which the mission entrusted by Christ to his apostles continues to be exercised in the Church until the end of time: thus it is the sacrament of apostolic ministry. It includes three degrees: episcopate (The office & Dignity of Bishop), presbyterate ( The office of Elder or Priest), and diaconate (the office of Deacon).
1556 To fulfill their exalted mission, "the apostles were endowed by Christ with a special outpouring of the Holy Spirit coming upon them, and by the imposition of hands they passed on to their auxiliaries the gift of the Spirit, which is transmitted down to our day through episcopal consecration.
1563 "Because it is joined with the episcopal order, the office of priests shares in the authority by which Christ himself builds up and sanctifies and rules his Body. Hence the priesthood of priests, while presupposing the sacraments of initiation, is nevertheless conferred by its own particular sacrament. Through that sacrament priests by the anointing of the Holy Spirit are signed with a special character and so are configured to Christ the priest in such a way that they are able to act in the person of Christ the head."
“We [bishops and priests] need your prayers,” he said, “for, even the bishop and the priest may be tempted.” Bishops and priests should pray much, proclaim Jesus Christ Risen, and “boldly preach the message of salvation.” However, he said, “We are men and we are sinners,” and, “we are tempted.”:
“Pray for us,” “that we might be poor, that we might be humble, meek, in the service of the people.” pray, pray for us bishops and priests.
Edited from Pope Francis’ exhortation during Mass on 15th May 2013