Now we come to the application of the parable that Jesus tells his apostles. He speaks to them emphatically. The story they just heard touches them directly. Again, Jesus uses the word douloi for servants, slaves.
The disciples should not think too highly of themselves. Another Greek word that Jesus uses here, archeioi, emphasizes this. This word means unworthy, without pretensions, humble.
The slave only did what was expected of him. Saying that, it does not mean that his work had no value. For what that servant did certainly had meaning for his master.
The soil had to be ploughed and opened up for the seeds of grain, the sheep needed good care, and the master needed a good meal after a busy workday. All of it is very beneficial work.
This also applies to the apostles when they go out into the world later on. Their proclamation of the meaning of Jesus’ work, of his redeeming death for the sins of men, and Jesus sitting at God’s right hand in heaven is of great importance for those who listen. But with all this important work, a sense of humility is fitting. It may never be about their honour and their position. They may never elevate themselves by saying, See all the tremendous things I did; how much I achieved for God!
(see further Luke 18:11–14).
This attitude is not fitting for a Christian, however fruitful he may be in the kingdom of God.
The Heidelberg Catechism touches on this very accurately in answer 63 to the question: But do our good works earn nothing, even though God promises to reward them in this life and the next?
As answer to this we read, This reward is not earned; it is a gift of grace.
Underneath this answer we rightly see the referral text Luke 17:10: So you also, when you have done all that you were commanded, say, We are unworthy servants; we have only done what was our duty.
10 So you also, when you have done all that you were commanded, say, ‘We are unworthy servants;we have only done what was our duty.’”