Why is the concept of the Kingdom of Heaven important for Christians?

The concept of the Kingdom of Heaven is vital for Christians because it encapsulates the sovereignty of Christ as King over His people. The Gospel’s narrative, which began with a small group of disciples, blossomed into a global movement, affirming that God's kingdom is both active and growing. It serves to remind believers that despite worldly trials, God's kingdom will prevail and that they are part of something far greater than themselves—a divine plan unfolding throughout history that guarantees salvation and eternal life through Christ.