📖 Biblical Definition
Hardening in Scripture operates on two levels. First, there is self-hardening — the human heart progressively resists God's Word, suppresses truth, and becomes calloused through repeated disobedience. "But exhort one another every day... that none of you may be hardened by the deceitfulness of sin" (Hebrews 3:13). Second, there is divine hardening — God's judicial act of giving a person or nation over to their own rebellion, removing restraining grace, and confirming them in their chosen path. The paradigmatic case is Pharaoh: "The LORD hardened the heart of Pharaoh" (Exodus 9:12). Paul explains this principle in Romans 9:18: "He has mercy on whomever he wills, and he hardens whomever he wills." Divine hardening is not arbitrary cruelty — it is the righteous judgment of God upon those who have persistently refused His grace.
📜 Webster 1828 Definition
Making hard or more hard; making firm; confirming in wickedness or opposition.
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HARD'ENING, ppr. Making hard or more hard; making firm; confirming in effrontery, obstinacy, wickedness or opposition. Note: Webster captures both the physical and moral senses — hardening is confirmation in resistance, whether by one's own choice or by divine judgment.
📖 Key Scripture
• Exodus 9:12 — "But the LORD hardened the heart of Pharaoh, and he did not listen to them."
• Romans 9:18 — "So then he has mercy on whomever he wills, and he hardens whomever he wills."
• Hebrews 3:13 — "Exhort one another every day... that none of you may be hardened by the deceitfulness of sin."
• Romans 1:28 — "Since they did not see fit to acknowledge God, God gave them up to a debased mind."
⚠️ Modern Corruption
Divine hardening is denied to protect a sentimental view of God.
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Modern theology frequently refuses to accept that God actively hardens hearts. The passages about Pharaoh are explained away as mere permission — "God allowed Pharaoh to harden himself" — rather than the active judicial hardening the text describes. This stems from an unwillingness to accept the full counsel of Scripture regarding God's sovereignty over human hearts. If God never hardens, then Romans 9:18 is meaningless. If hardening is only self-inflicted, then God's role in redemptive history is reduced to that of a passive observer. The biblical picture is far more sobering: there comes a point where God confirms a person in their rebellion, and from that point there is no return. This should produce both holy fear and urgent evangelism.
Usage
• "Pharaoh hardened his own heart repeatedly, and then God hardened it further — divine hardening is always judicial, never arbitrary."
• "The most terrifying judgment is not fire from heaven but the hardening of the heart — when God gives a man over to His own desires."