How do we know God's grace is truly sovereign?

The doctrine of sovereign grace affirms that salvation is entirely a work of God, rooted in His eternal decree. Jonah 2:9 states, 'salvation is of the Lord,' signifying that God's decision to save His chosen ones is not contingent upon human will but is according to His own purpose. The New Testament reinforces this with passages like Ephesians 1:4-5, where it declares that God chose us in Christ before the foundation of the world. Therefore, the assurance we have of God's grace lies in His unchanging nature and His ultimate authority over all aspects of salvation.