How do we know God's plan is sovereign and unchangeable?

The sermon articulates that God does not operate with contingency plans; His decrees are eternal and fully sovereign. Despite human rebellion and attempts to hinder His work, God's plan moves inexorably forward, ensuring that His ultimate purpose is accomplished. Scripture consistently affirms this truth, as seen in Romans 8:19-21, which shows that all of creation awaits the fulfillment of God's promises. His sovereignty means that all events, even those stemming from human sin, serve to advance His divine plan for glory and redemption.