Why is the gospel of the kingdom important for Christians?

The gospel of the kingdom represents the core of Christian belief: that God's reign is established through Christ, and that through His life, death, and resurrection, believers are granted access to His kingdom. This message not only brings hope of salvation but also encourages believers to live under Christ's lordship, reflecting the righteousness that comes from Him. As stated in Matthew 6:33, Christians are called to seek first the kingdom of God and His righteousness, which transforms their lives and relationships as they submit to Christ's reign in every aspect of life.