Mortal Sin in the Catholic Church

Why this matters

Many Catholics fear the words "mortal sin", and many others no longer care. Neither is what the Church teaches. Mortal sin is real and serious, yet the Church teaches about it so that we return to God, not so that we live in fear. Scripture is honest: if we say we have no sin we deceive ourselves, but if we confess our sins God is faithful and just and will forgive us (1 John 1:8-9). This article explains what mortal sin is, how to judge it, and what to do afterwards.

Sin is an offense against reason, truth and right conscience; it wounds love of God and neighbor (CCC 1849-1850).

1. The three conditions of mortal sin

The Church teaches that a sin is mortal only when three conditions are met together (CCC 1857):

• Grave matter. The act itself is a serious matter. The measure is the Ten Commandments, as Jesus reminded the rich young man (Mark 10:19; CCC 1858).
• Full knowledge. The person knows the act is evil and against God's law.
• Complete consent. The person acts freely and deliberately, not under compulsion or without awareness (CCC 1859).

If one condition is missing, the sin is not mortal. Ignorance, fear, pressure, strong habit or inner disturbance can reduce, even remove, a person's responsibility (CCC 1860; 1735). Yet the Catechism also warns that no one should be presumed ignorant of the moral principles written in every conscience, and that sin born of malice, a deliberate choice of evil, is the gravest (CCC 1860). So not every serious wrong is automatically a mortal sin, and not everyone who falls in a grave matter is fully guilty.

The reverse matters too: do not use these conditions as an excuse to excuse yourself. Only God sees the heart fully. We are asked to judge deeds and to examine our own heart honestly, not to judge the hearts of others (Matt 7:1-2). See CCC 1857-1860.

2. Mortal and venial sin

The Church distinguishes the two, and the difference is more than one of size.

St. Thomas Aquinas gives the measure, and the Catechism quotes him (CCC 1856): a sin is mortal when the will chooses something contrary to the love of God (for example blasphemy or perjury) or of neighbor (for example murder or adultery). It is venial when the disorder does not go against that love, such as an idle word or immoderate laughter (Summa Theologiae I-II q. 88 a. 2).

John already distinguishes them: there is sin that leads to death and sin that does not (1 John 5:16-17). James reminds us that we all fall in many ways (James 3:2), so venial sin is part of weak human life. James also describes the path: desire, when left alone, gives birth to sin, and sin when full-grown gives birth to death (James 1:14-15). Venial sin does not break friendship with God, but it carries a temporal punishment that needs purification (CCC 1863; 1472). St. Augustine warns against making light of it: many small drops fill a river, many grains make a heap, and above all our hope is confession (Augustine, In epistulam Ioannis ad Parthos 1,6). So venial sin left to become a habit weakens the heart and opens the way to mortal sin (CCC 1863). It should not be taken lightly, and it should not make us despair. See CCC 1854-1855 and 1861-1863.

3. What counts as mortal sin?

The Church does not give a closed list, but it gives a measure. The Ten Commandments express man's fundamental duties toward God and neighbor, so their content carries grave obligations (CCC 2072). The New Testament also names deeds that close the way to the Kingdom of God: fornication, idolatry, quarrels, envy, drunkenness and the like (Gal 5:19-21; 1 Cor 6:9-10). Jesus points to the heart as the source: from within come evil thoughts, murder, adultery, greed and pride (Mark 7:21-22).

A few notes:

• Gravity differs. Murder is graver than theft, and destroying another's good name is graver than a harsh word spoken in a moment (CCC 1858-1859).
• Sin is not only doing but also failing to do. Jesus judges those who did not help the hungry, the naked and the sick (Matt 25:41-46; James 4:17).
• Capital sins are not the same as mortal sins. The seven capital sins (pride, greed and so on) are the roots of bad habits that give birth to other sins (CCC 1866). The habit is not necessarily a mortal sin; the acts that grow from it can be.

If you doubt whether something is grave, do not guess alone. Ask a priest, catechist or spiritual director. See CCC 1852-1853.

4. May I receive Communion after a mortal sin?

The answer: confess first. Paul warns that whoever eats the bread or drinks the cup of the Lord unworthily is guilty of the body and blood of the Lord, and so each must examine himself (1 Cor 11:27-29). The Church reads this as: a person aware of grave sin needs the sacrament of Penance before receiving Communion (CCC 1385; 1415).

Church law puts it this way: a person conscious of grave sin may not receive Communion without prior sacramental confession, unless there is a grave reason and no opportunity to confess. In that case the person must make an act of perfect contrition, including the resolution to confess as soon as possible (Can. 916; CCC 1452-1453).

Some practical points:

• Perfect contrition comes from love of God and includes the resolve to confess (CCC 1452). It is not a shortcut around confession, but a guide for situations where confession is not possible.
• Do not stay away from the Eucharist out of excessive fear. Communion is not a prize for saints, but food for weak pilgrims. The Eucharist wipes away venial sins and preserves us from mortal sins (CCC 1394-1395).
• Receiving in mortal sin without confession is sacrilege, a grave offense against the Eucharist (CCC 2120; 1385).
• Eucharistic fast. Abstain from food and drink, except water and medicine, for one hour before Communion (Can. 919).
• If in doubt whether your sin is grave, speak to a priest before receiving. See CCC 1385 and 1415.

5. How to confess a mortal sin well

Jesus gave the apostles power to forgive sins (John 20:22-23), and the Church exercises it in the sacrament of Penance. The parable of the lost son shows God's heart: the father runs to meet his returning son (Luke 15:20). The steps:

• Examination of conscience. Look at your life before God, with the help of the Ten Commandments or the Beatitudes (CCC 1454).
• Contrition and the resolve to amend. The best contrition springs from love: sorrow for having wounded the all-good God (perfect contrition). Sorrow from fear of punishment or from the ugliness of sin (imperfect contrition) is also enough to receive forgiveness in the sacrament (CCC 1451-1453). A firm purpose is not a guarantee never to fall again, but a sincere will to avoid sin and its occasions with God's grace. The Act of Contrition is available in the Prayer menu.
• Confession. All mortal sins remembered after a careful examination must be named, with their kind and number, even if it feels embarrassing (CCC 1456; Can. 988). Begin with the gravest or most embarrassing sin so the rest is easier to say, and tell the priest when you last confessed. Venial sins may, and are encouraged to, be confessed (CCC 1458).
• Absolution and penance. The priest forgives in the name of Christ and gives an act of satisfaction, a prayer or good deed that helps repair the effects of sin, including temporal punishment (CCC 1449; 1459-1460; 1472-1473). Listen to his counsel and answer "Amen" at the absolution.

Some common questions:

• Nervous or lost for words? Tell the priest plainly, for example: "Father, please help me, I don't know where to begin." He will ask what is needed; answer honestly.
• No mortal sin to recall? Confess some venial sins and close with sorrow for all past sins (CCC 1458).
• A sin was forgotten? A mortal sin forgotten without fault is forgiven together with the others in absolution. Mention it in the next confession (traditional teaching of the Church).
• Ashamed to confess? The priest is bound by the absolute seal of confession and may reveal nothing (CCC 1467).
• How often? Every believer is obliged to confess grave sins at least once a year (Can. 989). If there is a mortal sin, do not wait.

6. Too afraid, or numb?

There are two opposite tendencies.

Scruples: feeling sinful all the time even after confessing, and doubting whether the confession was valid. Such a heart suffers rather than drawing closer to God. The basic teaching: God is greater than our heart and knows everything (1 John 3:19-20), and there is no condemnation for those in Christ (Rom 8:1). The pastoral guide: choose one regular confessor or guide, follow his advice, and do not repeat the same confession over and over. If the anxiety strongly disturbs daily life, do not hesitate to seek professional help as well. That does not contradict faith.

A numb heart: sin slowly feels normal and the voice of conscience grows quiet. The letter to the Hebrews urges us to encourage one another every day so that none of us is hardened by the deceitfulness of sin (Heb 3:13). The psalmist's prayer can be our guide: "Search me, O God, and know my heart" (Ps 139:23-24). A sensitive conscience is formed through the Word of God, prayer and the guidance of the Church (CCC 1783-1785).

Both need the same thing: to trust that God's forgiveness is greater than our sin. See CCC 1776-1778.

7. Those who did not know: ignorance and conscience

Is a person who does not know the Church's teaching certainly guilty of mortal sin when he breaks it? Not automatically. An erroneous conscience that cannot be avoided is not held against the person (CCC 1790-1791). Jesus himself distinguishes: the servant who knew his master's will and did not do it is beaten more than the one who did not know (Luke 12:47-48). Paul says the law of God is written on the hearts of the Gentiles (Rom 2:14-15).

For example, someone who does not know that deliberately missing Sunday Mass is a grave matter, perhaps through poor catechesis, is not necessarily guilty of mortal sin. Once he knows and still stays away, he is bound. Likewise a lie told because one's family is threatened is less grave than a lie told under no pressure (CCC 1860). But some basic principles cannot be presumed unknown to anyone, such as that killing an innocent person is wrong.

But there are limits, and here the Church asks us to be honest:

• Willful ignorance does not excuse. A person who avoids the truth because he fears he must change, or who is too lazy to find out, remains responsible (CCC 1791-1792).
• We must form our conscience. Through the Word of God, the Catechism and the guidance of priests and catechists (CCC 1783-1785).
• This is not relativism. Moral teaching does not change with taste. What varies is a person's individual responsibility, and only God weighs it perfectly (CCC 1735).

This teaching should make us humbler in judging others, and more serious in examining ourselves.

8. Mortal sin and hell: what the Church teaches

The Church teaches that hell exists, and that dying in mortal sin without repentance means being separated from God forever (CCC 1033; 1035; 1861). Jesus speaks about this in earnest (Matt 25:46).

But the heart of the teaching is not a threat. First, God predestines no one to hell. A person goes to hell by deliberately refusing God's love to the end (CCC 1037). Second, God wants all to be saved and to repent (1 Tim 2:4; 2 Pet 3:9). The prophet Ezekiel writes the word of the Lord: I take no pleasure in the death of the wicked, but that he turn and live (Ezek 18:23). Third, the Church never declares that a particular person is surely in hell. The Church names saints who are surely in heaven, but never the reverse. The Church prays that no one should perish (CCC 1058).

So the purpose of this teaching is an invitation to repent while there is still time. We are asked to stay awake, not to frighten others (Matt 24:42). See CCC 1033-1037.

9. The sin against the Holy Spirit

Jesus says that every sin and blasphemy will be forgiven, but blasphemy against the Holy Spirit will not (Matt 12:31-32; Mark 3:28-30; Luke 12:10). Many people fear they have done it.

According to the Catechism, God's mercy has no limits. But whoever deliberately refuses that mercy, refuses to repent, and so rejects the forgiveness offered by the Holy Spirit, shuts himself off from salvation. Such hardness of heart can end in final impenitence (CCC 1864). So what cannot be forgiven is not a particular word or deed, but a heart's stance that refuses forgiveness itself.

Pastorally, this means: a person who fears he has done it, and longs for forgiveness, shows by that very longing that his heart has not closed. Whoever still wants to return to God can still return (Luke 15:18-20). If this fear weighs heavily on you, speak with a priest. See CCC 1864 and 1861.

10. Quick questions and answers

Is missing Sunday Mass a mortal sin? The Catechism teaches that those who deliberately fail in the obligation of Sunday and holy day Mass commit a grave sin. Those who cannot attend for a serious reason, such as illness, caring for an infant or a sick person, long travel, or no Mass within reach, do not sin. The pastor can grant a dispensation (CCC 2180-2183; Heb 10:25).

What about suicide? Life is a gift of God, and the Church teaches that suicide is contrary to love of self and of God (CCC 2280-2281). But the Catechism also affirms that grave psychological disturbance, anxiety, fear or great suffering can diminish the responsibility of the one who commits it (CCC 2282). The Church teaches that we should not despair of the salvation of those who have taken their own lives, for God can give them the opportunity for salutary repentance in ways known only to him (CCC 2283). If you or someone near you is thinking of ending a life, please contact someone you trust, your local emergency services, or a mental health professional right away. You do not have to carry this alone.

What about masturbation? The Catechism calls it an act that is of itself gravely disordered. But to judge a person's responsibility, it asks us to consider immaturity, the force of habit, anxiety and other psychological or social factors that can lessen, even remove, moral guilt (CCC 2352). Do not face it with self-disgust; talk to a wise confessor.

What if I doubt whether it is a mortal sin? Check the three conditions in the first section. If you still doubt, tell the priest about the doubt in confession and follow his guidance. Do not decide alone out of fear (CCC 1778; 1783).

11. Examples of grave matter in the Catechism

Below are examples the Catechism calls grave, or that touch the basic duties of the Ten Commandments. This is not a closed official list and does not replace a priest's judgment. Remember that an act is a mortal sin only when the three conditions in section 1 are met.

A few notes for fairness:

• Civil divorce is not in itself a sin when it is the only way to secure legal rights, inheritance or the care of children (CCC 2383). What is grave is remarrying while the earlier valid marriage stands (CCC 1650; 2384).
• Homosexual acts are called disordered by the Catechism (CCC 2357), yet it also asks that persons with homosexual tendencies be accepted with respect, compassion and sensitivity, and that every sign of unjust discrimination be avoided (CCC 2358).
• Regulation of births. The Catechism rejects acts specifically intended to prevent procreation as an end or a means, and does not forbid medical means necessary to cure a disease even if they foreseeably impede procreation, provided that is not directly willed (CCC 2370; 2399).
• Suicide and masturbation still call for attention to factors that lessen responsibility, as explained in section 10 (CCC 2282; 2352).
• Freemasonry. The Congregation for the Doctrine of the Faith (26 November 1983) declared that Catholics who join Masonic associations are in a state of grave sin and may not receive Holy Communion.
• The Fourth Commandment (parents and children) is left out of the table because gravity depends on circumstances. What is clear is that parents must raise their children in the faith (CCC 2221-2226).

Part of this list was drawn up with the help of a list circulating online. Each item was matched to the Catechism from memory, so the numbers need to be checked.

12. Examination of conscience by the Ten Commandments

Examining your conscience helps you recall sins before confession (CCC 1454). These questions are not a list of sins but a guide to ask yourself honestly before God. Begin with a short prayer asking the Holy Spirit for light.

**First commandment: I am the Lord your God, you shall have no other gods (CCC 2084-2141).**

• Do I put God first in my life, and pray regularly?
• Have I seriously doubted or rejected the faith, or trusted in fortune-telling, horoscopes, mediums or magic?
• Have I received Communion in grave sin or without enough preparation?
• Have I ever deliberately left a grave sin out of confession?

**Second commandment: you shall not take the name of the Lord in vain (CCC 2142-2167).**

• Have I used the name of God, Our Lady or the saints disrespectfully, in anger or as a joke?
• Have I sworn needlessly or falsely, and kept the promises I made to God?

**Third commandment: keep holy the Lord's day (CCC 2168-2195).**

• Have I deliberately missed Mass on Sundays and holy days, or often come late without reason?
• Do I take part in Mass attentively, or let myself be distracted?
• Do I keep Sunday as a day of rest and togetherness, and observe the required fasting and abstinence?

**Fourth commandment: honor your father and mother (CCC 2196-2257).**

• Children: do I honor and help my parents, or am I rude and disobedient?
• Parents: do I teach my children to pray, bring them to church, set a good example, and watch what they see and read?
• Do I obey lawful authority and fulfill my civic duties honestly?

**Fifth commandment: you shall not kill (CCC 2258-2330).**

• Have I hurt anyone, held grudges and hatred, or refused to forgive?
• Have I been involved in, encouraged or supported abortion or euthanasia?
• Do I care for my health and life, and avoid drunkenness, drugs and reckless driving?
• Have I led others into sin by my words, example or urging?

**Sixth and Ninth commandments: you shall not commit adultery, you shall not covet your neighbor's wife (CCC 2331-2400; 2514-2533).**

• Have I consented to thoughts and desires against purity, sought indecent images or shows, or entered situations that are clearly a temptation?
• Have I had sexual relations outside marriage or committed other impure acts, alone or with others, and how often? Were there circumstances that made it graver?
• Dating: do I protect my partner from the danger of sin, and make love the main reason for the relationship?
• Spouses: am I faithful to my marriage vows in thought and deed, respectful of my spouse's rights, and open to the gift of life (CCC 2366-2372)?

**Seventh and Tenth commandments: you shall not steal, you shall not covet your neighbor's goods (CCC 2401-2463; 2534-2557).**

• Have I taken or damaged what belongs to others, cheated in business or dealings, or not returned what I took or borrowed?
• Do I pay debts and wages justly, and give to the poor and the Church according to my means?
• Am I greedy, envious or wasteful, or lazy in my work or studies?

**Eighth commandment: you shall not bear false witness (CCC 2464-2513).**

• Have I lied, slandered, spread gossip or revealed secrets without reason?
• Have I accused anyone unjustly, and repaired the harm caused by my lies?

When you are done, make an honest act of sorrow and a firm resolution. Then go into the confessional calmly: God awaits you as the Father who runs to meet his child (Luke 15:20).

Summary

• Mortal sin needs three conditions: grave matter, full knowledge, complete consent (CCC 1857).
• It breaks love for God, but can be healed through the sacrament of Penance (CCC 1446; 1856).
• After a mortal sin, confess before receiving Communion, unless there is a grave reason and no opportunity to confess (Can. 916).
• Excessive fear and a numb heart are both met by trusting that God's love is greater than our sin (1 John 3:20).
• God predestines no one to hell. God wants everyone to repent (2 Pet 3:9).

This article is a general explanation and not a substitute for a priest's guidance. The Catechism and canon numbers were written by The Catholica and should be checked by a priest or catechist.

Sources

• Catechism of the Catholic Church (CCC) 1033-1037, 1385, 1394-1395, 1415, 1446, 1449, 1451-1460, 1467, 1472-1473, 1735, 1776-1778, 1783-1785, 1790-1792, 1849-1869, 2072, 2120-2121, 2180-2183, 2280-2283, 2352 (tap a number to read the text).
• Code of Canon Law, Can. 916, 919, 988-989.
• St. Thomas Aquinas, Summa Theologiae I-II q. 88 a. 2 (quoted in CCC 1856); St. Augustine, In epistulam Ioannis ad Parthos tractatus 1,6; John Paul II, Reconciliatio et Paenitentia 17 (quoted in CCC 1855-1857, 1863).
• Congregation for the Doctrine of the Faith, Declaration on Masonic Associations, 26 November 1983.
• Scripture: the verses linked above.
• St. Gregory the Great, Moralia in Job XXXI, 45 (list of capital sins; cited in CCC 1866).