Is It Ever Right to Lie?
The Commandment About Truth
“You shall not bear false witness against your neighbour” (Exodus 20:16). In its original setting, the eighth commandment forbade lying in court — giving false testimony that could ruin an innocent person. But the Church has always understood it more broadly, as a commandment about truthfulness in everything we say (CCC 2464–2513).
It raises one of the most practical moral questions there is. Is it ever right to lie? What about white lies to spare someone’s feelings? What about lying to protect someone in danger? The Church’s answer is clear, but it is more nuanced than many people expect.
Why Truth Matters
God is truth. Jesus said, “I am the way, and the truth, and the life” (John 14:6). The devil, by contrast, is “a liar and the father of lies” (John 8:44). To love the truth is to be on God’s side.
Truth also holds human society together. We depend on each other’s words constantly — in friendships, families, business, medicine, law and politics. Every lie weakens that trust. A world where no one could believe anyone would be a world where no relationship could survive.
What a Lie Is
The Catechism, following St Augustine, defines a lie as speaking a falsehood with the intention of deceiving (CCC 2482). Three things are involved: saying something you believe to be false, to someone, intending to lead them into error.
This definition matters, because it shows what is not a lie.
An honest mistake is not a lie. If you say something false believing it to be true, you are wrong, but you are not lying.
Jokes, stories and fiction are not lies. When everyone understands that you are not making a real claim — a novel, a play, an obvious joke — there is no intention to deceive.
Silence is not a lie. Choosing not to speak is not the same as speaking falsely.
Lying Is Always Wrong
The Church teaches that lying is wrong in itself. It is not wrong only when it causes harm. It is wrong because it misuses the gift of speech, which exists to communicate truth (CCC 2485). This means we may not tell a lie even for a good purpose.
This is a demanding teaching, and the Church acknowledges that the seriousness of a lie varies. A lie told to cover up a serious crime, to destroy someone’s reputation, or under oath is grave. A small, thoughtless lie that harms no one — a “white lie” — is usually a venial sin (CCC 2484). Both are wrong, but they are not equally wrong.
But You Do Not Have to Tell Everything
This is the part of the teaching many people miss. The duty not to lie is not the same as a duty to reveal everything you know.
The Catechism teaches that the right to receive the truth is not unconditional. Charity and respect for truth should guide what we say, and “no one is bound to reveal the truth to someone who does not have the right to know it” (CCC 2488–2489). We may stay silent, decline to answer, change the subject, or speak discreetly — as long as we do not actually assert something false.
Discretion. A friend asks what you think of their haircut. You do not have to give a full critique. You can find something true and kind to say, or simply say it suits them if you think it does.
Privacy. A stranger asks personal questions. You have no obligation to answer.
Secrets. Some things must never be revealed. The seal of Confession is absolute: a priest may never reveal what he hears, under any circumstances. Professional secrets — those of doctors, lawyers and others — and confidences entrusted to us must also be kept, except in exceptional cases where keeping them would cause very grave harm (CCC 2490–2491).
The Hard Cases
Some cases test this teaching severely. The classic example comes from the Second World War: a family is hiding Jewish refugees, and soldiers knock on the door asking whether anyone is inside. Must they tell the truth?
No one in the Catholic tradition thinks the family should hand the refugees over. The question is how to protect them. The traditional answer, from Augustine and Aquinas, is that even here one should avoid a direct lie — by refusing to answer, by evasion, by speaking in a way that does not assert a falsehood. The soldiers have no right to the truth, so the family has no duty to give it to them, but they should still not lie.
Some Catholic thinkers have argued that in extreme cases like this, where someone is seeking information in order to commit a grave injustice, a false statement may not count as a lie in the full moral sense. This remains debated. What everyone agrees on is that the innocent must be protected, and that such extreme cases are very rare. They do not justify the everyday lies most of us are tempted to tell.
Other Sins Against Truth
The eighth commandment also covers other ways of wounding the truth and other people’s good name (CCC 2477–2479).
Rash judgement — assuming, without sufficient reason, that someone has done wrong.
Detraction — revealing someone’s real faults to people who had no need to know, damaging their reputation.
Calumny — telling lies about someone that damage their reputation. This is sometimes called slander.
Flattery — praising someone falsely, especially to encourage them in wrongdoing.
Boasting — exaggerating our own achievements.
Gossip, even when true, can easily slide into detraction. Before repeating something about someone, it is worth asking: is it true, is it necessary, and is it kind?
Making It Right
If we have lied or damaged someone’s reputation, the Church teaches that we have a duty to make reparation as far as possible — correcting the falsehood or restoring their good name (CCC 2487). This can be humbling, but it is part of genuine repentance.
Living in the Truth
Truthfulness is not just about avoiding lies. It is a virtue — a habit of being honest in word and deed, of being the same person inside and out. It takes courage, because the truth is sometimes uncomfortable. It takes charity, because truth without love can be cruel. “Speaking the truth in love” (Ephesians 4:15) is the Christian ideal.
People who never lie are rare. But they are trusted, and they are free. They never have to remember what story they told, or fear being found out. As Jesus said, “The truth will make you free” (John 8:32).
For an overview of all ten, see What Does the Church Teach About the Ten Commandments?