What does it mean that Christ's kingdom is not of this world?

When Jesus stated that His kingdom is not of this world, He underscored the spiritual nature of His reign. He emphasized that His kingdom operates under divine principles and authority, contrasting with worldly systems often upheld by force. His followers are called to rely on spiritual power rather than temporal means, recognizing that true strength lies in faith and truth. This understanding encourages Christians to engage in the world with courage and truth, proclaiming the gospel without resorting to coercion or violence, reflecting the heart of Christ's message.