What does the Bible say about God's sovereignty in mercy and hardening hearts?

In Romans 9:18, the Apostle Paul explains that God has the sovereign right to extend mercy to some and to harden others, reflecting His perfect justice and holiness. This raises a significant theological question about human culpability and divine sovereignty. Paul emphasizes that as divine Creator, God possesses absolute mastery over His creation, akin to a potter with clay, having the privilege to mold some as vessels of honor and others as vessels of dishonor (Romans 9:21). The premise is that all humanity is fundamentally deserving of God's wrath due to sin, but God chooses to manifest His mercy to certain individuals for His glory and according to His purpose.