What Is Blasphemy? The Definition, and the Fear Underneath It

Blasphemy is speech or conduct that treats God with contempt. The Greek word behind it in the New Testament, blasphemia, is an ordinary word for slander or abusive speech, and it is used of people as well as of God. Applied to God it means reviling him, misrepresenting him deliberately, or treating what is holy as worthless.

That is the definition, and it takes about thirty seconds. If you came for it you now have it.

A great many people searching this phrase are not after a definition. They are frightened that they have done it. The rest of this page is written for them, because every other answer to this question stops exactly where the real question starts.

What it meant in the Bible

In the Hebrew Scriptures it is a serious offence against the name of God. Leviticus 24 describes a case where it carried the death penalty, which tells you the weight the word carried rather than how any tradition applies it now.

In the New Testament the charge appears repeatedly, and the irony is hard to miss: Jesus himself is accused of it, more than once, for claiming authority the people hearing him believed belonged to God alone. He was condemned under that charge.

The letters extend it beyond speech. Paul writes about conduct that causes God's name to be reviled among people who are watching, which is a broader category than swearing. On that reading, a man whose public religion and private life do not match is closer to the biblical sense of the word than a man who said something furious at a funeral.

The unforgivable sin, and what it actually describes

This is the part that frightens people, so it is worth reading the scene rather than the summary.

In Mark 3 and Matthew 12, Jesus has been healing people. Religious leaders who have watched him do it conclude publicly that he is driving out demons by the power of Beelzebul. They are not confused and they are not asking a question. They are looking directly at the work of God, naming it the work of evil, and doing so to protect their own position. That is the context in which he says that blasphemy against the Holy Spirit will not be forgiven.

Traditions differ on exactly how to frame it, and they converge on the shape. What is being described is settled, deliberate, and made in full knowledge. A hardened position rather than an outburst, a thought, or a season of doubt. Several traditions put it more simply still: the unforgivable thing is the final refusal of the only thing that forgives.

Is taking the Lord's name in vain the same thing

Related, and narrower than most people assume, and this one is worth getting right because a lot of unnecessary guilt is attached to it.

The third commandment says not to take the name of the Lord your God in vain. The Hebrew phrase is about emptiness or worthlessness, and a large body of scholarship across traditions reads it primarily as a prohibition on swearing falsely by God's name: invoking him to guarantee something untrue, or attaching his authority to your own position to make it unchallengeable. Using God as a reference for a lie.

On that reading, the man who swears when he drops something heavy on his foot is doing something considerably less serious than the man who tells people God is behind a decision he made for his own reasons. Traditions still vary on how far the commandment extends into casual speech, and almost none of them treats it as the most serious end of the category.

It is worth noticing which of those two a person in a double life is closer to. Not the swearing.

Is blasphemy a crime

In the United States, no. Several states kept blasphemy statutes on the books into the twentieth century and they are not enforceable, because the First Amendment protects speech about religion including speech that offends. A handful of those dead laws were only formally repealed in recent decades.

Elsewhere it varies enormously. England and Wales abolished the common law offence in 2008. A number of countries, particularly where religious and civil law are not separated, still prosecute it and some carry severe penalties. That is a genuinely different world from the one most people searching this phrase are living in, and it is worth not confusing the two.

Why the people who ask are almost never the people it describes

There is an answer that pastors and priests across traditions have been giving for centuries, and it is worth having in plain language.

The fear is itself the evidence. A man who had hardened himself against God in the way that passage describes would not be awake at one in the morning worried about it. He would not care. The caring is the thing that is not supposed to be there.

There is also a pattern in the text itself. Peter denies knowing Jesus three times, with swearing, and is restored by name. Paul describes himself as having been a blasphemer and a violent man, and says he was shown mercy. The book does not treat the category as a trapdoor that people fall through by accident, and nobody in it is disqualified for having said something terrible in a bad week.

That is the common answer, not ours to issue, and we would still rather you took the question to a pastor or a priest who knows you than to a website. What we will say is the part that is our field, which is what the fear is usually doing.

When the thoughts are intrusive rather than chosen

Some people reading this are not describing something they said. They are describing thoughts that arrive uninvited, often the single worst sentence imaginable, frequently in church, and always about the thing they care most about.

That is a recognised clinical pattern rather than a spiritual verdict. Unwanted intrusive thoughts of exactly this kind are a well documented feature of obsessive compulsive disorder, and the religious form of it has a name, scrupulosity. The defining feature is that the thoughts are experienced as horrifying and unwanted, which is the opposite of contempt.

The reason this matters practically is that the usual response makes it worse. Praying harder, confessing it repeatedly, checking whether the feeling has gone, and avoiding anything that might trigger it are all compulsions, and compulsions feed the cycle. If that is what is happening, the help you need is a therapist who works with OCD, and it is treatable rather than a thing to endure for twenty years.

We are not diagnosing anybody from a web page. If what you recognise there is yours, it is worth one conversation with somebody qualified rather than another decade of private checking.

What the fear is usually doing

Here is the thing we see most often, and it is not really about blasphemy at all.

Almost everybody is carrying something they are convinced would disqualify them from being loved. Some private thing they believe would make people step back if it were ever known. That near-universal certainty is the reason for the hiding, and the certainty is nearly always wrong. The unforgivable sin is a convenient container for it, because it converts a diffuse conviction of being unacceptable into a specific charge with a scriptural name.

Which matters because of what that conviction produces. Brannon's chain: if I believe nobody could love me as I am, I live in hiding, hiding breeds shame, and shame drives the behaviour I cannot stand in myself. The verdict a man is carrying about himself is frequently the engine rather than the brake.

There is an exercise somebody once gave a man early in recovery that is worth two minutes of your time. Draw a line down a page. On one side, the beliefs about your own worth that are actually true and that help you. On the other, the ones that keep a running tally of every failure and tell you that love has to be earned. Then tear the page in half, crumple the second side, and throw it out. That column was handed to you by somebody with an agenda. Start again from what is true, and the first true thing is that you are worth the work.

What to do with it

1. Say it out loud to one person who knows you. A pastor, a priest, a therapist, one friend. The fear survives on being unspoken and it shrinks noticeably the first time somebody else hears it without flinching.
2. Stop checking. Re-examining whether you still feel forgiven is the compulsion, and every check teaches the fear that the question is still open.
3. Separate the two questions. What does my tradition teach, which belongs to your tradition. And what is this fear doing in my life, which is answerable this week.
4. Get help if the thoughts are intrusive and repetitive. That is a clinical pattern with a treatment, not a measure of your standing.
5. Deal with the hiding, whatever it is attached to. Almost always the fear is sitting on top of something real that nobody knows about, and the real thing is the one to go and handle.

The thing to carry out of here: the word has a real meaning and it describes a hardened, deliberate position, not a bad thought and not a sentence said in anger. If the question has been eating you, the fear is far more likely to be shame wearing theological clothes, and shame is the thing that keeps a man stuck rather than the thing that keeps him good.