Impenitence

Impenitence is the hardening of the heart against God's call to repentance — the persistent refusal to acknowledge sin and turn to God. The Bible presents it as deeply dangerous, accumulating judgment for the day of wrath: "Because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath" (Rom. 2:5). Pharaoh's progressive hardening against God's plagues is the OT paradigm: both self-hardening and divine judicial hardening are described (Ex. 8:15, 32; 9:12; 14:4).

The prophets repeatedly warn cities and individuals that impenitence forfeits the mercy God extends: "If you will not repent, I will whet my sword" (Ps. 7:12). Jesus's Galilean ministry warnings are especially sobering: cities that witnessed his miracles and did not repent would face judgment more severe than Sodom (Matt. 11:20–24). The unforgivable sin — blasphemy against the Holy Spirit — is related to the settled, final rejection of the Spirit's witness to Christ. Hebrews warns against the hardening that can make repentance impossible (Heb. 6:4–6).