What Is the Unforgivable Sin?

Jesus speaks of this sin in three Gospels. Matthew and Mark place it in the same scene, and Luke records it among other sayings about confessing Jesus before others. Here are all three in the King James Version, which calls the Holy Spirit “the Holy Ghost”.

Notice how the warning begins. Before Jesus names the one sin that will not be forgiven, He says that “All manner of sin and blasphemy shall be forgiven unto men” (Matthew 12:31, KJV). The warning sits inside one of the widest promises of mercy in the Bible. Even a word spoken against Jesus Himself can be forgiven.

The setting explains the saying. In Matthew 12 a man possessed by a devil, blind and unable to speak, is brought to Jesus, and Jesus heals him. The crowd begins to wonder whether He is the promised son of David. The Pharisees answer with an explanation of their own: “This fellow doth not cast out devils, but by Beelzebub the prince of the devils” (Matthew 12:24, KJV). Mark says the accusers were scribes who had come down from Jerusalem, and he gives their charge as “He hath Beelzebub” (Mark 3:22, KJV).

Jesus shows how foolish the charge is, since Satan does not fight against himself, and then He gives the warning. Mark adds a line that tells us exactly why: “Because they said, He hath an unclean spirit” (Mark 3:30, KJV). These men were not confused seekers. They were teachers of Scripture who saw the Spirit of God at work in plain view and called it evil rather than bow to Jesus.

That is the heart of it. The Holy Spirit is the One who shows people their sin and points them to Christ (John 16:8). To look at His work and call it the devil's is to refuse the only light that leads home. The sin cannot be forgiven not because God's mercy runs out, but because it turns away from the mercy itself.

In everyday speech, blasphemy means speaking of God with contempt. In this passage it means something deeper than a rude word. Jesus says a word against the Son of man can be forgiven (Luke 12:10), and the Gospels show it. His own brothers did not believe in Him at first (John 7:5), yet after the resurrection they were praying with the disciples (Acts 1:14). Peter cursed and swore that he did not know Jesus (Mark 14:71), and Jesus restored him and told him to feed His sheep (John 21:15-17). Paul wrote that he “was before a blasphemer, and a persecutor, and injurious: but I obtained mercy” (1 Timothy 1:13, KJV).

What cannot be forgiven is a settled refusal of the Holy Spirit: seeing God's work clearly, knowing it is His, and still calling it evil and pushing it away for good. Three things follow from the passages themselves.

It is not an accident. No one commits it by slipping, misspeaking or having a thought they did not want.

It is a stance, not a slip. It sets itself against the Spirit who brings every sinner to repentance, so it shuts the door that forgiveness comes through. For what sin is and how God deals with it, see what is sin?

It does not want forgiveness. The men Jesus warned were not asking to be forgiven. They were sure they were right.

Christians across the centuries have explained this sin in different words, but they agree on its core: it is a deliberate, settled rejection of God's grace, not a single bad moment. Here is how the main traditions put it.

Augustine of Hippo wrote that the person who despises God's mercy “and persists to the last day of his life in his obstinacy of heart, is guilty of the unpardonable sin against the Holy Ghost” (Enchiridion, chapter 83). Later teachers such as Thomas Aquinas summed up his view as final impenitence: refusing to repent until death.

The Catholic Church teaches that “There are no limits to the mercy of God” (Catechism of the Catholic Church, 1864). The danger lies in deliberately refusing that mercy by refusing to repent, and the Catechism warns that such hardness of heart can lead to final impenitence and eternal loss. Centuries earlier, Aquinas wrote that even this “does not, however, close the way of forgiveness and healing to an all-powerful and merciful God” (Summa Theologiae II-II, question 14, article 3).

The Reformed tradition follows John Calvin, who said a person sins against the Holy Spirit “who, while so constrained by the power of divine truth that he cannot plead ignorance, yet deliberately resists, and that merely for the sake of resisting” (Institutes 3.3.22). Calvin thought this could be committed during a person's life, so he did not tie it to the moment of death as Augustine did.

The Wesleyan tradition reads it most narrowly. John Wesley called it “neither more nor less than the ascribing those miracles to the power of the devil, which Christ wrought by the power of the Holy Ghost” (Notes on Matthew 12:31). The Methodist Articles of Religion add that “Not every sin willingly committed after justification is the sin against the Holy Ghost, and unpardonable” (Article XII), and Article XVI of the Church of England says the same of sin after baptism.

Different words, one shared conviction: the sin Jesus warned about belongs to a heart that has hardened itself against God for good. It does not belong to a believer who stumbles, doubts or fears.

If you are afraid you have committed it, the fear itself is good news. The men Jesus warned were not afraid of offending God; they were sure they were right and wanted Jesus gone. A heart that has finally rejected God does not lie awake grieving over it. Your fear shows that the Holy Spirit is still at work in you, making you care about God and His forgiveness.

This is not a new pastoral word. In his sermon “A Call to Backsliders” John Wesley wrote that few people who take their souls seriously “have not felt some uneasiness for fear they had committed, or should commit, this unpardonable sin”. He told them they were “in no more danger of doing this, than of pulling the sun out of the firmament”. So take God at His word.

If Paul, who once hunted down Christians, could be forgiven, so can you. Come to God as you are, tell Him the truth, and trust His promise more than your fear.

For some people, the fear of having committed the unforgivable sin does not lift after reading the passages or hearing a pastor's reassurance. It returns again and again, sometimes with sudden blasphemous thoughts they hate and did not choose. If that sounds like you, please hear this kindly: it may be a form of anxiety, not a verdict on your soul.

The International OCD Foundation describes scrupulosity as a form of OCD in which the obsessions are about religion or morality, and the fear of committing blasphemy is one it names. Needing reassurance again and again is one of its marks. It can be treated: the main treatment is a kind of cognitive behavioral therapy called exposure and response prevention, and the Foundation says care can also involve your pastor or other leaders in your church. You can read more on the International OCD Foundation's page on scrupulosity.

Talk with a pastor you trust, and with a counselor who understands OCD. Asking for help is not a lack of faith. And if the fear has turned into despair, or you are thinking about ending your life, please reach out right now: in the US and Canada, call or text 988; in the UK and Ireland, call Samaritans on 116 123; anywhere else, find a line at findahelpline.com.

Two passages in Hebrews often get tied to the unforgivable sin, and they can feel just as frightening.

Hebrews was written to believers under pressure to give up on Christ. The people these verses describe have not simply sinned again. They have turned their backs on Jesus altogether: they “crucify to themselves the Son of God afresh” (Hebrews 6:6, KJV). The sin of Hebrews 10:26 is spelled out a few verses later as treading the Son of God under foot and having “done despite unto the Spirit of grace” (Hebrews 10:29, KJV). Reject the only sacrifice for sins, and no other one is left.

Christians read these warnings in different ways. The Reformed tradition holds that those God has truly called “can neither totally nor finally fall away from the state of grace” (Westminster Confession 17.1). The Anglican and Methodist articles say that a believer may depart from grace and, by the grace of God, rise again. For the full discussion, read can I lose my salvation?

Whatever view you hold, notice who these verses describe: people who no longer want Christ. The writer himself adds, “But, beloved, we are persuaded better things of you” (Hebrews 6:9, KJV). Wesley told worried listeners that because they shuddered at the thought of rejecting Christ's sacrifice, that sacrifice still remained for them. If you are reading this because you want to come back to God, you are not the person these verses describe.