Since the King is the Prince of Peace (Isa 9:6), the kingdom is not about power or coercion, but about love and service. Christians are forbidden to lord it over others or to imitate the rulers of this world. What about "forcefully advancing the kingdom"? The phrase suggests that coercion and perhaps violence are justified, yet this contradicts the example and Spirit of Christ. Note: Eventually the NIV corrected their unfortunate translation of Matthew 11:12.