The unmerciful servant (MT 18:21-35) is a parable taught by Jesus to explain the importance of forgiving and being merciful. In the passage Jesus compares the kingdom of heaven to a King, who wishes to retrieve the debts he is owed. He forgives a slave who owes him more money than his life is worth, but the slave does not show mercy to a fellow slave. The king finds out and punishes the first slave for his actions of selfishness and greed.
In the parable, there are three events that represent the three major themes. Forgiveness, sanctification (mercy)
and judgement.
The first point, forgiveness, can be understood when we recognise the three symbols in the story.