What does it mean that Christ reigns in a spiritual kingdom?

In John 18:36, Jesus makes it clear that His kingdom is not of this world, emphasizing that His reign is spiritual rather than political. This means that His authority governs the hearts of believers, guiding them in spiritual matters rather than worldly affairs. Our calling as Christians is to proclaim this kingdom, urging people to bow to Christ as King, rather than focusing on the establishment of earthly kingdoms or political reform. Aligning with His spiritual kingdom requires a shift in our priorities to reflect His values.