5 But what are we to say of the hireling? He is not mentioned here among the good. “The good Shepherd,” He says, “gives His life for the sheep. But he that is an hireling, and not the Shepherd, whose own the sheep are not, sees the wolf coming, and leaves the sheep, and flees; and the wolf catches them, and scatters the sheep.” The hireling does not here bear a good character, and yet in some respects is useful; nor would he be called an hireling, did he not receive hire from his employer.
Who then is this hireling, that is both blameworthy and needful? And here, brethren, let the Lord Himself give us light, that we may know who the hirelings are, and be not hirelings ourselves. Who then is the hireling? There are some in office in the church, of whom the Apostle Paul says, “Who seek their own, not the things that are Jesus Christ's.” What means that, “Who seek their own”? Who do not love Christ freely, who do not seek after God for His own sake; who are pursuing after temporal advantages, gaping for gain, coveting honors from men.
When such things are loved by an overseer, and for such things God is served, whoever such an one may be, he is an hireling who cannot count himself among the children. For of such also the Lord says: “Verily, I say unto you, they have their reward.” Listen to what the Apostle Paul says of St. Timothy: “But I trust in the Lord Jesus to send Timothy shortly unto you, that I also may be of good comfort, when I know your circumstances; for I have no man like-minded, who will naturally care for you.
For all seek their own, not the things which are Jesus Christ's.” The shepherd mourned in the midst of hirelings. He sought some one who sincerely loved the flock of Christ, and round about him, among those who were with him at that time, he found not one. Not that there was no one then in the Church of Christ but the Apostle Paul and Timothy, who had a brother's concern for the flock; but it so happened at the time of his sending Timothy, that he had none else of his sons about him; only hirelings were with him, “who sought their own, not the things which are Jesus Christ's.”
And yet he himself, with a brother's anxiety for the flock, preferred sending his son, and remaining himself among hirelings. Hirelings are also found among ourselves, but the Lord alone distinguishes them. He that searches the heart, distinguishes them; and yet sometimes we know them ourselves. For it was not without a purpose that the Lord Himself said also of the wolves: “By their fruits you shall know them.” Temptations put many to the question, and then their thoughts are made manifest; but many remain undiscovered.
The Lord's fold must have as overseers, both those who are children and those who are hirelings. But the overseers, who are sons, are the shepherds. If they are shepherds, how is there but one Shepherd, save that all of them are members of the one Shepherd, to whom the sheep belong? For they are also members of Himself as the one sheep; because “as a sheep he was led to the slaughter.”
Source: Tractates on the Gospel of John (New Advent)