A worker who sees himself as an unprofitable servant, sees order clearly and serves God well.
A worker who does not, will never serve God in His favor for he/she thinks there's merit in his/her works.
...Luk 17:9 Doth he thank that servant because he did the things that were commanded him? I trow not.
Luk 17:10 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.