Interpretation
This parable suggests that "even the best of God's servants are still unworthy because they have only done their duty and no more." Nobody, "no matter how virtuous or hardworking, can ever put God in his or her debt."
William Barclay relates the parable to the last verse of the Isaac Watts hymn "When I Survey the Wondrous Cross":
Were the whole realm of Nature mine,
That were an offering far too small;
Love so amazing, so divine,
Demands my soul, my life, my all.
The phrase "unworthy servant" in the last verse of the parable is widely used liturgically, such as in the Liturgy of St. John Chrysostom.
Read more about this topic: Parable Of The Master And Servant