Jesus said to the apostles:
Which of you, having a servant plowing or feeding cattle, will say to him when he has come from the field, Go and sit down and eat?
Will you not say to him, Make ready that with which I may sup, and gird yourself, and serve me, till I have eaten and drunken; and afterward you shall eat and drink?
Does he thank that servant because he did the things that were commanded him?
I think not.
So likewise you, when you 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.