“Most certainly I tell you, all sins of the descendants of man will be forgiven, including their blasphemies with which they may blaspheme; but whoever may blaspheme against the Holy Spirit never has forgiveness, but is subject to eternal condemnation.” —because they said, “He has an unclean spirit.”
Short answer
Jesus warns that blasphemy against the Holy Spirit will not be forgiven. In context, He says it to religious leaders who, when He freed people from demons, declared that He did it by Satan’s power. Christian teachers widely agree that people who are afraid they have committed this sin almost certainly have not.
If you are worried
Many people come to this question frightened that they have committed a sin God will never forgive. If that is you, start here: across Catholic, Orthodox and Protestant traditions, pastors and teachers have long said that the person who is afraid of having committed this sin has almost certainly not. The very fact that you care whether God forgives you is a sign that your heart has not turned against Him.
The Bible’s promises of forgiveness are wide: “If we confess our sins, He is faithful and righteous to forgive us the sins and to cleanse us from all unrighteousness” (1 John 1:9). Jesus says, “He who comes to Me I will in no way throw out” (John 6:37).
What Jesus said, and when
The saying appears in Mark, Matthew and Luke. Mark gives the fullest setting. Jesus has been casting out demons and healing, and scribes from Jerusalem explain His power this way: “He has Beelzebul,” and, “By the prince of the demons He casts out the demons” (Mark 3:22). Jesus answers that Satan does not drive out Satan, and then gives the warning:
“Most certainly I tell you, all sins of the descendants of man will be forgiven, including their blasphemies with which they may blaspheme; but whoever may blaspheme against the Holy Spirit never has forgiveness, but is subject to eternal condemnation.” —because they said, “He has an unclean spirit.”
Mark adds the reason in verse 30: they had said Jesus had an unclean spirit.
Matthew tells the same story after Jesus heals a man who was blind and mute (Matthew 12:22–24):
Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men. Whoever speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, either in this age, or in that which is to come.
Notice two things. First, Jesus begins with a sweeping promise: “all sins of the descendants of man will be forgiven, including their blasphemies.” Even words spoken against “the Son of Man” can be forgiven. Second, the warning is aimed at people who were faced with an unmistakable act of God’s mercy, a suffering man set free, and called it the work of the devil. It describes a settled refusal to recognize God at work, not a single careless word or a passing doubt.
How Christians understand it
Christians agree on the setting but describe the sin in somewhat different ways.
- Catholic teaching connects it with a deliberate and final refusal of God’s mercy. The Catechism of the Catholic Church says there are no limits to God’s mercy, but whoever deliberately refuses to accept it by repenting rejects the forgiveness the Holy Spirit offers (§1864). On this reading the sin is unforgivable not because God withholds mercy but because the person will not receive it.
- Protestant interpreters often describe it as a persistent, hardened rejection of the Spirit’s witness to Jesus. Some hold that it could only be committed in the specific way the scribes did, by people who saw Jesus’ miracles in person.
Both readings lead to the same pastoral conclusion: the door is closed only from the inside, and anyone who wants to return to God has not shut it.
Other passages that worry people
Readers sometimes connect this saying with Hebrews 6:4–6, about those who fall away, or with the “sin leading to death” in 1 John 5:16–17. Christians interpret these passages in a variety of ways, and the Bible does not explicitly identify either of them with the saying in Mark and Matthew. The same letter of John that mentions sin leading to death also says that “if our heart condemns us, God is greater than our heart, and knows all things” (1 John 3:20).
Where to turn
If this fear keeps returning however often you are reassured, you are not alone, and you do not have to carry it by yourself. A priest or pastor can talk it through with you; Catholics may find great relief in the sacrament of reconciliation. If the worry feels constant or overwhelming, talking with a counselor or doctor is wise, and seeking that help is not a lack of faith. In the United States you can call or text 988 at any time.
The Forgiveness page gathers more of what Scripture says about God’s readiness to forgive.