How do we know that God's mercy is sovereign?

The sovereignty of God's mercy is clearly articulated in Romans 9:15, where God emphasizes His ultimate authority in bestowing mercy. This means that God's acts of grace are unconditioned and based solely on His will, not human effort or merit. The doctrine reminds believers that salvation is entirely a work of God's grace, not something we can earn or choose on our own. This assurance provides profound comfort, as it underscores His commitment to redeeming His people according to His good pleasure.