4 The good shepherd gives himself for the sake of his sheep. And again He said:— I have other sheep and I must bring them also hither. And the whole flock shall be one, and one shepherd, and My Father because of this loves Me; that I give Myself for the sake of the sheep. And again He said— I am the door of the sheep. Every one that enters by Me shall live and shall go in and go out and find pasture. O you pastors, be made like that diligent pastor, the chief of the whole flock, who cared so greatly for his flock.
He brought near those that were afar off. He brought back the wanderers. He visited the sick. He strengthened the weak. He bound up the broken. He guarded the fatlings. He gave himself up for the sake of the sheep. He chose and instructed excellent leaders, and committed the sheep into their hands, and gave them authority over all his flock. For He said to Simon Cephas:— Feed My sheep and My lambs and My ewes. So Simon fed His sheep; and he fulfilled his time and handed over the flock to you, and departed.
Do ye also feed and guide them well. For the pastor who cares for his sheep engages in no other pursuit along with that. He does not make a vineyard, nor plant gardens, nor does he fall into the troubles of this world. Never have we seen a pastor who left his sheep in the wilderness and became a merchant, or one who left his flock to wander and became a husbandman. But if he deserts his flock and does these things he thereby hands over his flock to the wolves.
Source: Demonstrations (New Advent)