Why is preaching the kingdom of God important?

Preaching the kingdom of God is of utmost importance because it encapsulates the essence of the gospel message — the reign of Christ over the hearts of His people. In Acts 28:31, Paul is seen 'preaching the kingdom of God and teaching those things which concern the Lord Jesus Christ.' This proclamation invites listeners to submit to the sovereign authority of Christ, revealing His grace and love. Understanding this reign of Christ reassures believers of His eternal rule and providential care over their lives, emphasizing that salvation is entirely by grace and not dependent on human effort.