Christians will one day judge the whole world, including the angels. Therefore, it only stands to reason that we ought to be able to sort out grievances and lawsuits against one another. This passage shows us what God expects of churches embroiled in personal grievances.
The ethical behavior of the local church is supposed to emulate the holiness of heaven. Therefore, unrepentant sin cannot be tolerated among God’s people. This passage tells us what God expects His church to do with such a person in her ranks of membership.