6 I beseech you, you pastors, that you set not over the flock, leaders who are foolish and stupid, covetous also and lovers of possessions. Every one who feeds the flock shall eat of their milk. And every one who guides the yoke shall be ministered to from his labour. The priests have a right to partake of the altar, and the Levites shall receive their tithes. Whoever eats of the milk, let his heart be upon the flock; and let him that is ministered to from the labour of his yoke, take heed to his tillage.
And let the priests who partake of the altar serve the altar with honour. And as for the Levites who receive the tithes, they have no portion in Israel. O pastors, disciples of our great Pastor, be not like hirelings; because the hireling cares not for the sheep. Be like our Sweet Pastor, Whose life was not dearer to Him than His sheep. Rear up the youths and bring up the maidens; and love the lambs and let them be reared in your bosoms; that when you shall come to the Chief Pastor, you may offer to Him all your sheep in completeness, and so He may give you what He has promised: Where I am, you also shall be. These things, brief as they are, will be sufficient for the good pastors and leaders.
Source: Demonstrations (New Advent)