The Greek word sklērýnō, represented by G4645, means to indurate or, figuratively, to render stubborn. It appears 6 times across 6 unique verses in the Bible. This term is used to describe the hardening of one's heart, a state of stubborn resistance or unbelief.
In the biblical narrative, G4645 is primarily used as a solemn warning. The book of Hebrews repeatedly cautions believers, "Harden not your hearts, as in the provocation" (Hebrews 3:8, Hebrews 3:15). This state is directly linked to the danger of being hardened through the "deceitfulness of sin" Hebrews 3:13. In Acts, the term describes individuals who "were hardened, and believed not" Acts 19:9. The concept is also framed as an act of divine will in Romans, which states that God has mercy on whom He wills, "and whom he will he hardeneth" Romans 9:18.
Several related words help clarify the context and consequences of being hardened:
- G539 apátē (delusion): This word for deceitfulness is identified as a direct cause of hardening. Believers are exhorted daily lest they be hardened by the "deceitfulness of sin" Hebrews 3:13.
- G544 apeithéō (to disbelieve): To be hardened is closely associated with willful disbelief. In Ephesus, some were hardened and as a result "believed not" Acts 19:9.
- G1653 eleéō (to compassionate): This term for showing mercy is presented as the divine counterpoint to hardening. It establishes a contrast between God's compassion and His sovereign will to harden Romans 9:18.
The theological weight of G4645 is significant, highlighting critical spiritual principles.
- A Response to God's Voice: The command to not harden one's heart is consistently presented as the proper response "if ye will hear his voice" (Hebrews 3:15, Hebrews 4:7), framing it as a crucial human choice.
- Caused by Sin and Deceit: The Bible warns that this hardened condition is not random but can be a direct result of sin's influence, specifically its deceitfulness Hebrews 3:13.
- Divine Sovereignty: The concept also encompasses God's sovereign prerogative. Romans 9:18 clearly states that just as God chooses to have mercy, He also chooses whom He hardeneth, placing the ultimate action within His will.
In summary, G4645 signifies more than simple stubbornness; it is a critical spiritual state. It describes a heart rendered unresponsive, whether through the influence of sin and disbelief or as an act of God's sovereign judgment. The repeated warnings against it underscore the importance of maintaining a soft heart that is able to hear and respond to God's voice.
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