📖 Biblical Definition
Hardness of heart is the sinful condition of insensibility, obstinacy, and unresponsiveness toward God—a heart grown calloused to His word, unmoved by His mercies, and unyielding to His warnings, like stone that takes no impression. Scripture speaks of it constantly. The fallen heart is a heart of stone, which only God can replace with a heart of flesh. Pharaoh is the archetype: again and again he hardened his heart against the word and works of God, and at length God gave him over, hardening him judicially in the obstinacy he had chosen. Israel in the wilderness hardened their hearts in the day of provocation, and the warning rings down to the church: “To day if ye will hear his voice, harden not your hearts.” Hardness of heart is both a sin man commits and a judgment God inflicts: men harden themselves by resisting the truth, despising mercy, and persisting in sin, until that self-hardening passes into a judicial hardening whereby God confirms the rebel in the very disposition he has cultivated. It is exceedingly dangerous because it is progressive and self-concealing: each act of resistance thickens the callus, each despised warning deadens the conscience further, until the heart that once trembled feels nothing at all. The peril is that a man may sin his way into an insensibility from which he cannot, of himself, return. The only remedy lies wholly outside the sinner: the sovereign, regenerating grace of God, who promises to take away the stony heart and to give a heart of flesh, writing His law upon it by His Spirit. Hence the urgent biblical summons not to delay—“to day,” while the heart can still hear.
📜 Webster 1828 Definition
Webster 1828 defines HARDNESS, in a moral sense, as obduracy; impenitence; confirmed state of wickedness; insensibility to the calls and warnings of God.
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HARDNESS, n. — ...6. Obduracy; impenitence; confirmed state of wickedness; as hardness of heart. 7. Insensibility; want of tender feeling or susceptibility.
HARD, a. — ...Obdurate; insensible; not easily impressed or moved; as a hard heart.
📖 Key Scripture
Ezekiel 36:26 — "A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh."
Hebrews 3:7-8 — "Wherefore (as the Holy Ghost saith, To day if ye will hear his voice, Harden not your hearts, as in the provocation, in the day of temptation in the wilderness."
Exodus 8:15 — "But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the Lord had said."
Romans 2:5 — "But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath."
⚠️ Modern Corruption
No major postmodern redefinition, but the danger is its own progressive nature—a culture of constant gospel exposure can breed a calloused familiarity, and repeated resistance deadens the conscience until warnings no longer register.
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Hardness of heart is less redefined than quietly cultivated, and one of its most subtle breeding-grounds is the very familiarity of the gospel. In a culture saturated with Christian language—where sermons are abundant, the Bible is available, and the truths of salvation are heard from childhood—there is a peculiar peril of gospel-hardening: the heart grows so accustomed to the message that it ceases to feel it. The warnings that once pierced now glance off; the mercies that once melted now bore; the man sits unmoved under preaching that ought to undo him, mistaking his familiarity for understanding and his numbness for peace. Repeated exposure without response does not soften the heart; it calluses it.
This reveals the dreadful mechanism of the doctrine: hardness of heart is progressive and self-concealing. Every despised warning, every resisted conviction, every postponed repentance lays down another layer of callus, until the conscience that once trembled grows silent. And because the hardening dulls the very faculty that would perceive it, the man is the last to know how far he has gone. Pharaoh did not feel himself hardening; he felt himself reasonable, even resolute. This is why Scripture presses its great “to day”—harden not your hearts, while yet ye can hear—for delay is not neutral but actively deadening. The only deliverance is sovereign grace, which alone can take away the heart of stone; and the only safe response to the Word is immediate, for the heart that can still be grieved is a heart that can still be saved.
🔗 Greek & Hebrew Roots
The doctrine rests on the heart of stone (Hebrew lēb hā’eben) and the Greek sklērokardia / pōrōsis (hardening, callusing) that God alone can reverse.
Usage
"Hardness of heart is both a sin men commit by resisting God and a judgment God inflicts by confirming the rebel."
"Gospel familiarity can breed its own hardness—a calloused heart unmoved by the truths it has heard a thousand times."
"Scripture presses its urgent ‘to day’ because hardness is progressive: each despised warning deadens the conscience further."
📖 In the Text
Chapters of the reading Bible where this entry is linked.