What does it mean that God shows mercy to whom He will?

The doctrine of God's sovereign mercy highlights that He chooses to show mercy to whom He wills, as articulated in Romans 9:15-16. This principle reflects the grace we see in Joseph's dealings with his brothers, as he exercises authority to determine their fate. God's mercy is not a matter of human effort or worthiness; rather, it is a reflection of His gracious nature. The sermon emphasizes that the Lord made Himself strange to us before revealing His mercy, akin to Joseph's actions. The recognition of this truth fosters a sense of gratitude and assurance for believers, as God's mercy is grounded in His sovereignty and love, not in our actions.