Cyril of Alexandria
Catena Aurea · Lukasevangelium 17
But which of you, having a servant plowing or feeding cattle, will say unto him by and by, when he is come from the field, Go and sit down to meat? And will not rather say unto him, Make ready wherewith I may sup, and gird thyself, and serve me, till I have eaten and drunken; and afterward thou shalt eat and drink? Doth he thank that servant because he did the things that were commanded him? I trow not. So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.
Our Lord teaches us that it is no more than the just and proper right of a master to require, as their bounden duty, subjection from servants, adding, Doth he thank that servant because he did the things that were commanded him? I trow not. Here then is the disease of pride cut away. Why boastest thou thyself? Dost thou know that if thou payest not thy debt, danger is at hand, but if thou payest, thou doest nothing thankworthy? As St. Paul says, For though I preach the Gospel I have nothing to glory of, for necessity is laid upon me, yea, woe is unto me if I preach not the Gospel. (1 Cor. 9:16.)