“When he had said this, he showed them his hands and his side. The disciples rejoiced when they saw the Lord. [Jesus] said to them again, “Peace be with you. As the Father has sent me, so I send you.”  And when he had said this, he breathed on them and said to them, “Receive the holy Spirit. ” 

-John 20:20-22

"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, presbyterate, and diaconate."

-CCC 1536

"Holy Orders, in its three grades of bishop, priest and deacon, is the Sacrament that enables a man to exercise the ministry which the Lord Jesus entrusted to the Apostles, to shepherd his flock, in the power of his Spirit and according to his Heart. Tending Jesus’ flock not by the power of human strength or by one’s own power, but by the Spirit’s and according to his Heart, the Heart of Jesus which is a heart of love. The priest, the bishop, the deacon must shepherd the Lord’s flock with love. It is useless if it is not done with love. And in this sense, the ministers who are chosen and consecrated for this service extend Jesus’ presence in time, if they do so by the power of the Holy Spirit, in God’s name and with love."

-Pope Francis
Pope Francis "General Audience." 26 March 2014, https://www.vatican.va/content/francesco/en/audiences/2014/documents/papa-francesco_20140326_udienza-generale.html