What does the Bible say about God's sovereignty in predestination?

Scripture consistently presents God as the sovereign ruler who declares the end from the beginning, thereby establishing His absolute control over all events in history. In Isaiah 46:9-11, God reaffirms His unique sovereignty by stating that His counsel will stand and He will accomplish all His purpose. Similarly, Ephesians 1:4-5 demonstrates that believers were chosen in Christ before the foundation of the world, underscoring the doctrine of predestination as an act of God's sovereign will rather than an arbitrary allowance of human choice. This divine decree reveals that salvation is solely rooted in God's grace and purpose, and not in human decision-making, aligning with the historic Reformed understanding of predestination.