How does the preaching of the Gospel relate to the Kingdom of God?

Preaching the Gospel is fundamentally the same as proclaiming the Kingdom of God. As presented in Acts 19, Paul boldly disputed and persuaded the people about the Kingdom for three months. The Gospel reveals the nature and character of the King, Jesus Christ, who offers salvation to His people. Scripture passages highlight that the preaching of the Gospel was central to the ministry of Jesus and His followers, focusing on the salvation and righteousness established through Christ (Matthew 4:23, Acts 28:31). This shows that to preach the Gospel is to declare the good news of the Kingdom, where Christ reigns and saves according to His eternal plan.