It is the Word of the Lord and His Word accomplishes what it says. Our favorable or unfavorable circumstances neither help nor hinder the power of the Gospel of Jesus Christ.
In this parable, notice how Jesus invites us to consider that forgiveness is something more than a moment. It is a way of grace that extends throughout an entire kingdom.
Paul attempts to break down the walls which the early Christians effortlessly erected between those of different ethnic origins — specifically Jews and Gentiles — to drive them to the will and mind of Christ: Worship together as one body.