What is the Unforgivable Sin (Blasphemy Against the Holy Spirit)?
Question 7006
Few passages in Scripture have caused more anxiety among believers than Jesus’ solemn warning about blasphemy against the Holy Spirit. People have come to me over the years, sometimes in tears, convinced they have committed this sin and are beyond hope. Before we even begin to unpack what this sin actually is, let me say plainly: if you are worried you have committed it, you almost certainly have not. The very fact that you care, that you fear, that you want to be right with God—these are signs of a heart that the Holy Spirit is still working in. Those who commit this sin have no such concerns.
The Context of Jesus’ Warning
The teaching about the unforgivable sin appears in three of the four Gospels. Matthew 12:31-32 records Jesus saying: “Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.” Mark 3:28-30 gives a parallel account, and Luke 12:10 records a similar statement. What prompted such a severe declaration from the lips of Jesus Himself?
The immediate context is absolutely essential for understanding this passage. Jesus had just healed a demon-possessed man who was blind and mute. The crowds were astonished and began asking, “Can this be the Son of David?” In other words, they were wondering if Jesus might be the promised Messiah. But the Pharisees, witnessing the exact same miracle, drew a very different conclusion. Matthew 12:24 tells us: “It is only by Beelzebul, the prince of demons, that this man casts out demons.”
Think about what the Pharisees were doing. They could not deny the miracle—a man who had been blind and mute was now seeing and speaking. The evidence of supernatural power was undeniable. But rather than acknowledge that this power came from God, they deliberately attributed it to Satan. They looked at the unmistakable work of the Holy Spirit and called it demonic. This was not ignorance. This was not a momentary lapse in judgment. This was a calculated, eyes-wide-open rejection of divine truth. They saw the light and called it darkness.
Understanding the Nature of This Sin
The Greek word for blasphemy is βλασφημία (blasphēmia), which means to slander, revile, or speak injuriously against someone. When directed at the Holy Spirit in the manner Jesus describes, it involves a complete and final rejection of the Spirit’s testimony about Jesus. The Holy Spirit’s primary ministry, as Jesus explained in John 16:8-11, is to convict the world concerning sin, righteousness, and judgment, and to testify about Jesus. When someone definitively and permanently rejects that testimony—not out of ignorance but with full knowledge—they cut themselves off from the only means of salvation.
Several scholars have helped clarify what this sin involves. Charles Ryrie explains that this was “a specific sin that the Pharisees committed during the earthly ministry of Christ by attributing His miracles to the power of Satan rather than to the Spirit of God” (Basic Theology, p. 269). J. Dwight Pentecost notes that “this sin involved a deliberate, willful rejection of the clear light that God had given through the ministry of Jesus” (The Words and Works of Jesus Christ, p. 234).
What makes this sin unforgivable is not that God is unwilling to forgive. God’s grace is infinite, and the blood of Jesus is sufficient for every sin ever committed. The issue is that the Holy Spirit is the One who brings people to repentance and faith. He convicts of sin, He reveals the truth about Jesus, He draws people to the Saviour. If someone completely and finally rejects the Spirit’s work, they have rejected the only avenue through which forgiveness comes. It is like someone dying of thirst who slaps away the only glass of water. The water could save them, but they refuse it.
Can This Sin Be Committed Today?
This is where believers need clarity and pastoral assurance. The specific sin Jesus described was committed by the Pharisees who personally witnessed His miracles and attributed them to Satan. In that precise form, it cannot be repeated today because Jesus is not physically present performing miracles that can be directly witnessed and blasphemed.
However, there is a broader principle at work. The unforgivable sin ultimately involves a hardened, final rejection of the Holy Spirit’s testimony about Jesus. Louis Sperry Chafer wrote: “The unpardonable sin is the sin of the unregenerate who wilfully and finally rejects the testimony of the Holy Spirit to the deity and saving power of the Lord Jesus Christ” (Systematic Theology, Vol. 7, p. 69). When someone persistently and finally refuses the Spirit’s conviction, when they suppress the truth in unrighteousness as Romans 1 describes, when they harden their hearts beyond the point of return, they place themselves beyond forgiveness—not because God’s grace is insufficient, but because they have rejected the very means by which forgiveness is received.
John Walvoord observes: “The unpardonable sin is not some mysterious sin that a believer might accidentally commit. It is the sin of unbelief carried to its ultimate conclusion—the complete and final rejection of Jesus Christ as presented by the Holy Spirit” (Jesus Christ Our Lord, p. 119).
Why Worried Believers Have Not Committed This Sin
If you are a believer in Jesus and you fear you may have committed this sin, take heart. The very nature of this sin makes it impossible for a genuine believer to commit. Consider: if you have trusted in Jesus for salvation, you have responded to the Holy Spirit’s testimony. You have believed, not blasphemed. The Spirit has done His work in you, bringing you to faith. That is the opposite of what the Pharisees did.
Furthermore, those who commit this sin are characterised by a complete absence of spiritual concern. They are not worried about their spiritual state. They are not seeking forgiveness. They have hardened their hearts so thoroughly that conviction no longer touches them. Your concern is evidence of a tender conscience, a heart still responsive to the Spirit. That is a good sign, not a bad one.
Even Peter, who denied Jesus three times, was restored. Even Paul, who persecuted the church and stood approving of Stephen’s murder, was saved and became the greatest apostle. “The saying is trustworthy and deserving of full acceptance, that Christ Jesus came into the world to save sinners, of whom I am the foremost” (1 Timothy 1:15). If Paul could be saved, anyone who comes to Jesus in genuine faith can be saved.
The Gospel Message
The warning about the unforgivable sin should not drive us to despair but to urgency. Today, if you hear the Spirit’s voice, do not harden your heart. The writer of Hebrews quotes Psalm 95:7-8 repeatedly: “Today, if you hear his voice, do not harden your hearts” (Hebrews 3:7-8, 15; 4:7). The danger is not accidentally slipping into unforgivable sin but gradually hardening oneself against the Spirit’s conviction until one can no longer respond.
The good news is this: “Everyone who calls on the name of the Lord will be saved” (Romans 10:13). If you can call, you can be saved. If you want forgiveness, it is available. Jesus said, “Whoever comes to me I will never cast out” (John 6:37). That promise stands for anyone who comes.
Conclusion
So what is the unforgivable sin? It is the complete, final, wilful rejection of the Holy Spirit’s testimony about Jesus—calling His work demonic, refusing His salvation, hardening oneself against His conviction to the point of no return. It is not an accidental sin, not a sin of weakness, not a sin that worried believers need to fear. But it is a warning: do not resist the Spirit. Do not harden your heart. Today is the day of salvation. Come to Jesus while the door is open, for He alone is the way, the truth, and the life.
“Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven.” Matthew 12:31
Bibliography
- Chafer, Lewis Sperry. Systematic Theology. Vol. 7. Dallas Seminary Press, 1948.
- Pentecost, J. Dwight. The Words and Works of Jesus Christ. Zondervan, 1981.
- Ryrie, Charles C. Basic Theology. Moody Press, 1999.
- Toussaint, Stanley D. Behold the King: A Study of Matthew. Multnomah Press, 1980.
- Walvoord, John F. Jesus Christ Our Lord. Moody Press, 1969.
