
Lying is a common human phenomenon that has been the subject of intense debate among moral theologians for centuries. The Catholic Church, which has dedicated numerous paragraphs in the Catechism to the importance of truthfulness, defines lying as speaking or acting against the truth to lead someone into error. This definition, attributed to St. Augustine, specifies that a lie consists of speaking a falsehood with the intention to deceive. While the Church considers lying to be morally wrong, there are complexities and exceptions that have been discussed by Catholic thinkers, especially in scenarios where lying may be justified to protect the innocent or oneself.
| Characteristics | Values |
|---|---|
| Lying | Speaking a falsehood with the intention of deceiving |
| --- | --- |
| Definition of Lying | A statement at variance with the mind |
| --- | --- |
| St. Augustine's View | Lying is always morally wrong |
| --- | --- |
| St. Thomas Aquinas's View | Lying is always wrong |
| --- | --- |
| Catechism's View | Lying is to speak or act against the truth in order to lead someone into error |
| --- | --- |
| Exceptions | Some Catholic thinkers believe that lying is acceptable in certain circumstances, such as self-defense or protecting the innocent |
| --- | --- |
| Mental Reservation | Saying something technically true but withholding part of the truth, which may be misleading |
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What You'll Learn

Lying is always morally wrong
The Catechism of the Catholic Church, which has forty-nine paragraphs dedicated to the importance of telling the truth, defines lying as "to speak or act against the truth in order to lead someone into error". St. Thomas Aquinas defines lying as "a statement at variance with the mind", while St. Augustine defines it as "a lie [that] consists in speaking a falsehood with the intention of deceiving". The Catechism also states that lying is "to speak or act against the truth in order to lead someone into error", and that it offends "against the fundamental relation of man and of his word to the Lord".
The Lord denounces lying as the work of the devil, and Jesus points out that Satan "does not stand in the truth because there is no truth in him" and that he "is a liar and the father of lies". Lying is also considered destructive to society as it undermines trust among people and tears apart the fabric of social relationships. Furthermore, it has been argued that lying is always wrong because, once a habit of untruthfulness has been contracted, it is practically impossible to restrict it to matters that are harmless.
However, despite these strictures, many well-formed Catholics believe it is permissible to lie in certain circumstances, such as to deceive thugs at the door or to hide Jewish refugees from the Nazis. Augustine and Aquinas were aware that even many good Christians disagreed with them and admitted that lying creates great difficulties for moralists. Some Catholic thinkers have also attempted to justify some forms of lying or dishonesty. For example, the concept of 'mental reservation' involves saying something that is technically true but withholding or reserving part of the truth. While this may involve deliberate deception, it does not involve a technically false statement.
In conclusion, while the Catholic Church teaches that lying is always morally wrong, the complexities of certain situations have led to disagreements among Catholics about the permissibility of lying in specific cases.
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Lying to save a life
The question of whether lying is acceptable in certain situations has been a topic of intense debate among Catholic theologians for centuries. While some argue that lying is always morally wrong, others believe that there may be exceptions, such as lying to save a life.
According to the Catechism of the Catholic Church, lying is "to speak or act against the truth in order to lead someone into error". This definition emphasizes the intention to deceive as a key aspect of lying. However, it is important to note that not all untruths are considered lies. For example, statements made in fiction or jest are generally not considered lies as there is no intention to deceive.
One of the Ten Commandments is "Thou shalt not bear false witness against thy neighbor", highlighting the importance of truthfulness in the Catholic faith. Augustine and Aquinas, two prominent Catholic scholars, argued that lying is always morally wrong, even to save a life. They believed that God is capable of protecting those who stand firm in the truth. However, even they acknowledged the complexities of this issue, as exemplified by Augustine's statement, "it is lawful to hide the truth prudently, by keeping it back".
Some Catholic thinkers have attempted to justify certain forms of dishonesty, such as the concept of mental reservation. This involves saying something that is technically true but withholding part of the truth, thereby allowing the listener to draw an incorrect conclusion without explicitly lying. For example, when asked about the whereabouts of a Jewish refugee during Nazi rule, one might respond, "I have not brought anyone into my house", while one's spouse or children may have done so. However, this approach has been criticized as a form of deliberate deception.
The Church's stance on lying has been a subject of discussion, with some claiming that it has stated that lying to save a life is occasionally obligatory. However, this claim has been disputed, and the Church's official position maintains that lying is a morally wrong action.
In conclusion, while the Catholic Church condemns lying as a violation of truthfulness, the complexity of certain situations, such as hiding Jewish refugees from Nazis or protecting a pregnant friend from an abusive boyfriend, has led to ongoing debates among theologians and Catholics alike.
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Lying to protect the innocent
The Catholic Church has long held that lying is a morally wrong action and a sin. This is based on the Ten Commandments, which includes "Thou shalt not bear false witness against thy neighbour", and the Catechism of the Catholic Church, which defines lying by quoting St. Augustine: "A lie consists in speaking a falsehood with the intention of deceiving".
However, this position has been debated by Catholic theologians for centuries, and some have argued that there are exceptions to the rule. For example, in the case of lying to protect the innocent, such as hiding Jewish refugees from the Nazis, some Catholics believe that it is permissible, or even obligatory, to deceive. This is because they interpret the commandment against lying as being subordinate to the commandment against murder.
Another argument for lying to protect the innocent is that it is sometimes necessary to protect secrets and defend oneself from the prying of the inquisitive. In such cases, one might withhold the truth or give a misleading impression without technically lying. This practice is known as "mental reservation", and an example of this is when St. Athanasius, fleeing persecution, replied to those searching for him, "He's not far away", while continuing to row in the opposite direction.
However, critics of mental reservation argue that it involves deliberate deception and is thus equivalent to lying. Furthermore, some Catholic theologians argue that lying is always wrong, regardless of the circumstances, and that God is capable of protecting the innocent without resorting to deception.
Overall, while the Catholic Church officially condemns lying as a sin, the question of whether it is ever permissible to lie to protect the innocent remains a subject of debate among Catholic theologians.
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Lying to murderous thugs
The Catholic Church teaches that lying is a morally wrong action and a sin. The Catechism of the Catholic Church defines lying by quoting St. Augustine: "a lie consists in speaking a falsehood with the intention of deceiving". However, the Church has also stated that it is okay to lie to save a life and even occasionally obligatory. This has been a topic of debate among Catholic theologians for centuries, with some arguing that lying is never permissible, while others believe there are exceptions to this rule.
When discussing the topic of lying to murderous thugs, it is important to consider the potential consequences of telling the truth. In certain extreme situations, such as hiding Jewish refugees from the Nazis, some Catholics may argue that it is permissible to deceive to protect innocent lives. This act of deception can be justified as self-defense or the defense of others. However, it is essential to note that this view is not universally accepted by all Catholic theologians.
St. Thomas Aquinas, a prominent Catholic scholar, defines lying as "a statement at variance with the mind". He argues that lying is intrinsically wrong and that one should not lie to Nazis about hiding Jews in one's attic. Aquinas suggests alternatives such as shutting the door without saying anything or using mental reservation, which involves speaking a technically true statement while withholding part of the truth.
On the other hand, some Catholic thinkers have attempted to justify certain forms of lying or dishonesty. For example, in the story of St. Athanasius, he replied, "He's not far away" when asked about the whereabouts of a heretic, implying that he was not hiding him but also not revealing his true location. This approach was later adopted by the Jesuits during the English persecution of the 16th and 17th centuries, where they took it to rather extraordinary extremes.
In conclusion, while the Catholic Church officially condemns lying as a sin, the act of lying to murderous thugs remains a complex ethical dilemma. Some Catholics may justify deception in extreme situations to protect innocent lives, but it is not a universally accepted view. The Church has not provided a definitive answer, and individuals must grapple with their conscience and moral principles when faced with such difficult choices.
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Lying to Nazis
The Catholic Church teaches that lying is always wrong. One of the Ten Commandments is "Thou shalt not bear false witness against thy neighbour". The Catechism of the Catholic Church states: "Lying is to speak or act against the truth in order to lead someone into error".
However, many people, including Catholics, believe that lying is sometimes necessary, especially when lives are at stake. During World War II, many Jews and their allies lied to the Nazis in order to survive. For example, a mother asked a German soldier to shoot her and her children immediately upon arrival at a concentration camp, rather than have her children taken away and killed. In another instance, a mother purchased false identity papers from a priest to disguise her children as Catholics, rather than Jews.
The concept of "mental reservation" has been used to justify such lies. Mental reservation involves saying something that is technically true but withholding or obscuring part of the truth. For example, when asked where a person is hiding, one might respond, "I have not seen them", while thinking to oneself, "...in the last 30 seconds". Critics argue that this is a deliberate deception and is therefore equivalent to lying.
The question of lying to Nazis is further complicated by the Nazis' own prolific use of propaganda and deception to justify their genocidal policies and turn sentiment against the Jews. The Nazis' big lie was their depiction of Germany as an innocent, besieged nation striking back at "international Jewry", which they blamed for starting World War I.
Ultimately, the Catholic Church's position on lying is nuanced, and the matter is not easily resolved. While the Church teaches that lying is always wrong, Catholic thinkers have debated the morality of lying for centuries, and many Catholics believe that lying is sometimes permissible, especially in life-or-death situations.
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Frequently asked questions
No, the Catechism of the Catholic Church states that "lying is to speak or act against the truth in order to lead someone into error". However, some Catholic thinkers have tried to justify some forms of lying or dishonesty.
According to St. Thomas Aquinas, lying is a "statement at variance with the mind". A lie is generally accepted to be a false statement made with the intention of deceiving.
Yes, Catholic divines and ethical writers commonly make a distinction between injurious (or hurtful), officious (or white), and jocose lies.








































