What is the unforgivable sin?

The unforgivable sin is what Jesus called blasphemy against the Holy Spirit. The Church teaches that it means deliberately refusing God's mercy by refusing to repent (CCC 1864). It can't be forgiven because the person won't accept forgiveness, not because God's mercy runs out. If you're afraid you've committed it, that fear is good evidence you haven't.

What did Jesus say about the unforgivable sin?

The words come in Mark's Gospel. Jesus has been casting out demons, and some scribes from Jerusalem claim he does it by the power of Satan. Jesus answers that "all sins will be forgiven the sons of men," but "whoever blasphemes against the Holy Spirit never has forgiveness" (Mark 3:28–29). Mark adds why he said it: they had claimed he had an unclean spirit (Mark 3:30).

Matthew tells the same story: "every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven" (Matthew 12:31–32). Luke has a shorter version (Luke 12:10).

Look at who Jesus was talking to. These men were watching God free people from evil, right in front of them, and calling it the devil's work. They saw the light and named it darkness, so they wouldn't have to change.

What is blasphemy against the Holy Spirit?

The Catechism gives the Church's answer in one paragraph. "There are no limits to the mercy of God," it says, but anyone who deliberately refuses to accept his mercy by repenting rejects the forgiveness of his sins and the salvation offered by the Holy Spirit. "Such hardness of heart can lead to final impenitence and eternal loss" (CCC 1864).

So the unforgivable sin is a stance of the heart: a settled, deliberate no to God's mercy, kept up to the end. No single word, act or thought commits it by accident. St John Paul II described it the same way in his 1986 encyclical on the Holy Spirit, Dominum et Vivificantem: a radical refusal to be converted, a refusal of the very salvation the Spirit offers.

That's why it can't be forgiven. Forgiveness is a gift, and a gift can be refused. God doesn't hold back his mercy from this person. The person shuts the door from the inside and won't let it open.

Have I committed the unforgivable sin?

If you're worried that you have, you almost certainly haven't. The person who commits this sin doesn't want God's mercy. You do, or you wouldn't be reading this. The fear itself shows that your heart is still turned toward God.

A few things that are not the unforgivable sin:

• Cursing God in anger, pain or grief.
• Saying something blasphemous as a joke, or years ago, before you cared.
• Leaving the Church, or living for years as if God didn't exist.
• Committing the same serious sin again and again.
• Doubting, or going through a time when you couldn't believe at all.

Some of these can be grave sins. All of them can be forgiven. Peter denied Jesus three times on the night he was arrested, and Jesus made him the head of his Church. Paul hunted down Christians before he became one. Your story isn't finished either.

What about blasphemous thoughts I can't stop?

Some people are troubled by sudden, ugly thoughts against God or the Holy Spirit that pop into their head uninvited, often right when they're praying. The harder they push the thoughts away, the louder they get. This is common, and it's especially common in people who struggle with anxiety or scrupulosity.

Unwanted thoughts are not sins. Mortal sin needs deliberate consent (CCC 1857), and a thought you hate and don't choose has none. The very distress you feel shows you don't agree with it. Don't argue with these thoughts or check over and over whether you meant them. Let them pass, turn back to what you were doing, and tell your confessor about them once. If they're constant and frightening, a Catholic counselor can help alongside the sacraments.

Does God forgive every other sin?

Yes. Jesus said so in the same breath: all sins will be forgiven. Murder, adultery, abortion, apostasy, years away from the Church: there is no offense so serious that the Church can't forgive it (CCC 982). The only condition is that you want forgiveness and turn back to God. We cover this more in does God forgive every sin and can mortal sins be forgiven.

The danger worth watching for is slowly deciding that you're too far gone for God to want you. That's despair, and it's a lie. As long as you're alive, you can turn back.

What should I do if I'm still afraid?

1. Tell God what you want. "Lord, I want your mercy. I'm sorry. Help me." That prayer is the opposite of the unforgivable sin.
2. Go to Confession. Confess any serious sins you're aware of, plainly. If it has been years, our guide to going back to Confession after years walks you through it.
3. Mention the fear. Tell the priest you've been afraid you committed the unforgivable sin. He can reassure you with the Church's authority, and that's worth more than any article.
4. Trust the absolution. When the priest says "I absolve you," believe it. If the fear comes back, answer it with the memory of those words.

God has been looking for you longer than you've been worried. Let him find you.