Why is the concept of a spiritual kingdom important for Christians?

Understanding the spiritual kingdom is crucial for Christians as it underscores that Christ's dominion is not confined to earthly powers but extends to the hearts and lives of His people. This concept reassures believers that despite worldly turmoil, their King is sovereign and actively rules over all aspects of their existence. Jesus mentioned that His kingdom comes not with observable power but through the transformation of lives, highlighting how He saves and reigns internally rather than through earthly authority. This assurance fosters peace amidst trials and inspires believers to live in light of His eternal reign.