Augustine of Hippo
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.
(de Quæst. Ev. ubi sup.) While His servants also are ministering, that is, preaching the Gospel, our Lord is eating and drinking the faith and confession of the Gentiles. It follows, And afterward thou shall eat and drink. As if He says, After that I have been delighted with the work of thy preaching, and refreshed myself with the choice food of thy compunction, then at length shalt thou go, and feast thyself everlastingly with the eternal banquet of wisdom.