Matthew 18:23 - 35
ESV - 23 Therefore the kingdom of heaven may be compared to a king who wished to settle accounts with his servants. 24 When he began to settle, one was brought to him who owed him ten thousand talents.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
I think that the parable is about forgiveness. God is always forgiving us until we don't forgive someone else.