Fasting is one of the oldest practices in religious humanity, and one of the three forms of Christian penance — along with prayer and almsgiving[1]. Christ himself fasted forty days in the desert[2], and taught not “if” but “when you fast”[3], as if it were self-evident. Yet few practices today are as widely misunderstood. In a culture of abundance, where food is everywhere and deprivation is suspect, the word evokes sometimes a diet, sometimes a sadness, sometimes a relic of a rigid Christianity thought to be past.
These misunderstandings are not all new. Many are as old as the practice itself: the Pharisaism that fasts to be seen, the rigorism that fasts to prove itself, the formalism that fasts with the stomach but not the heart. Christ and the prophets denounced these long before us. Others are peculiar to our time: the confusion of fasting with a wellness cure, or the idea that the modern Church has simply abolished fasting. All these errors share one thing in common: they separate the sign — the empty stomach — from what it signifies: a heart turned toward God.
This article reviews the most frequent misunderstandings about fasting, grouped according to whether they concern its nature, its place in Christian life, or its requirement. For each, it states the error in its common form, explains why it is appealing, why it is false, and then recalls what the Church really teaches.
This is neither a practical guide nor a collection of quotations: for the reasons and ends of fasting, see Why fast?; for detailed nature, current discipline, and concrete means of progress, see How to grow in fasting; for the voice of the Fathers, Doctors, and mystics, see What the saints say about fasting. Here, as in the twin article Common Misconceptions About Temperance, we clear the ground: first learning to recognize counterfeit coins in order to better receive the true gold.
Why Is Fasting So Misunderstood?
A Practice Emptied of Its Meaning in an Age of Abundance
For millennia, fasting was taken for granted: food was scarce, hunger familiar, and voluntarily abstaining for God carried obvious weight. Our era has reversed the scene. In societies of abundance, food is constant, cheap, omnipresent; the problem is no longer finding it, but having too much. As a result, voluntary deprivation seems at best eccentric, at worst morbid — a throwback, a mortification of another age.
This forgetfulness is not just a matter of comfort: it touches the very meaning of fasting. As long as fasting is understood simply as “eating less”, it indeed no longer has reason to be in the age of diets and snacking. But Christian fasting has never been primarily a matter of the stomach: it is a language of the body that expresses the conversion of the heart. The prophet Joel insists on this at the threshold of Lent:
“And now—declares the Lord—return to me with all your heart, with fasting, weeping, and mourning! Rend your hearts and not your garments, and return to the Lord your God.” — Joel 2:12-13[4]
Fasting only makes sense in relation to this return. Cut off from it, it becomes either a diet or a mutilation. Most of the errors that follow arise precisely from this severance: the gesture is kept but its soul is lost.
Between Laxity and Rigorism: Two Opposing Pitfalls
Like every spiritual discipline, fasting can be missed in two opposite ways, which reflect one another. By default, laxity: fasting is dismissed as unnecessary, outdated, unhealthy, unworthy of mature Christianity; one never fasts anymore and no longer even knows why one would fast. By excess, rigorism: fasting is made an end in itself, a performance, a measure of one’s own holiness; one fasts for oneself, against one’s body, sometimes against charity.
These two tendencies are opposite, but share the same error: the loss of discretion, that virtue of measure which orders all others. Saint Bernard makes it the guardian of all asceticism:
“Discretion puts order into every virtue; order gives measure and beauty, and even duration. […] Discretion is therefore not so much a virtue as a moderator of virtues. Remove it, and virtue becomes vice.” — Saint Bernard of Clairvaux, Sermons on the Song of Songs, 49[5]
True fasting walks the ridge between these two abysses: neither the soft abandonment of the laxist, nor the tense excess of the rigorist, but the right measure recognized here and now by reason enlightened by faith. All the errors detailed below relate to one or the other of these two tendencies.
Errors about the Nature of Fasting
"Fasting is only about abstaining from food"
This is the root error from which almost all others derive. People imagine that fasting is limited to the stomach: skipping a meal, eating plain food, avoiding meat. As long as nothing forbidden has been swallowed, one has “fasted.” This error is appealing because it is measurable, simple, verifiable—and because it limits the requirement to the belly alone.
But Scripture and the Fathers unanimously denounce this purely dietary fast as an empty shell. The key text is Isaiah 58, where God rejects the fast of those who starve themselves while oppressing the poor:
“Is not this the fast that pleases me: to loose the bonds of wickedness, to undo the straps of the yoke, to let the oppressed go free [...]? Is it not to share your bread with the hungry, and bring the homeless poor into your house [...]?” — Isaiah 58:6-7[6]
True fasting therefore involves the whole person, not just the mouth. Saint John Chrysostom unfolds it limb by limb in a famous passage:
“Let not only the mouth fast, but also the eye, and the ear, and the feet, and the hands, and all the members of our body. Let the hands fast by remaining pure from robbery and greed. […] Let the mouth fast from shameful words and insults. For what good is it to abstain from birds and fish if we bite and devour our brothers?” — Saint John Chrysostom, Homilies on the Statues, III[7]
To fast from the belly while gorging on slander, impure looks, or resentment is, in sum, what Tradition calls “abstaining from meat and devouring one’s brother.” The details of this “fasting of the eyes and the tongue” are developed in How to Grow in Fasting.
"Fasting is a detox cure or a wellness diet"
A very contemporary error that appropriates the word for a completely different use. “Intermittent fasting,” detox cures, therapeutic fasting are trendy: people fast to lose weight, cleanse their bodies, gain energy, or live longer. The outward gesture is the same; therefore, it is concluded that it is “the same thing,” modernized and stripped of its religious shell.
This confuses two acts that share only an appearance. Dietary fasting is ordered to the body: its goal is health, slimness, well-being. Christian fasting is ordered to God: its goal is conversion, prayer, charity. Saint Thomas clearly distinguishes the three proper ends of fasting—and none of them are weight loss or longevity:
“Fasting is practiced for a threefold purpose. First, to restrain the desires of the flesh. […] Second, so that the spirit may more freely ascend to the contemplation of heavenly things. […] Third, to make satisfaction for sins.” — Saint Thomas Aquinas, Summa Theologica, II-II, q. 147, a. 1[8]
A fast can be excellent for health and utterly worthless spiritually if it aims only at oneself. Benedict XVI sums it up: “Depriving oneself of the material food that nourishes the body facilitates [...] listening to Christ,” and fasting has “as its ultimate goal to help each of us [...] make a total gift of ourselves to God”[9]. Detox empties the stomach for the body; Christian fasting empties it to make room for God. Nothing forbids a fast from also being good for health—but that is never what makes it a Christian fast.
"Fasting is despising the body: it’s sad and morbid"
Here is the most persistent error, which places fasting on the side of sadness and hatred of the body. Fasting would be inflicting suffering on oneself, treating the flesh as an enemy, choosing gloom over the joy of life. One hears a Manichean echo here: matter is evil, pleasure suspect, holiness opposed to the body.
The Church has always rejected this vision: God created the body good, and fasting does not despise it, it liberates it. Far from prescribing a downcast face, Christ instead commands fasting in quiet joy:
“When you fast, anoint your head and wash your face, so that your fasting may not be seen by others but by your Father who is in secret.” — Gospel according to Saint Matthew 6:17-18[10]
Better yet: Christian fasting is not mourning, it is a nuptial expectation. When asked why his disciples do not fast, Jesus replies that the time of his presence is a wedding feast, and fasting will be the language of desire for the absent Bridegroom:
“Can the wedding guests mourn during the time when the bridegroom is with them? The days will come when the bridegroom is taken away from them; then they will fast.” — Gospel according to Saint Matthew 9:14-15[11]
Fasting does not hate the body: it lightens it so it may breathe toward God. Saint Basil even says that fasting “lifts prayer to heaven, serving as a kind of wing for its ascent”[12]. On the root of this error—the false asceticism that demonizes created goods—see Common Errors about Temperance.
"Fasting is earning God’s favor by proving oneself through effort"
A subtler and seemingly more pious error: fasting is conceived as a currency that buys divine favors, or as a performance that forces God’s admiration. “I fasted, therefore God owes me something.” This is, at bottom, a relapse into Pelagianism: saving oneself by works, pressuring God with privations.
But Scripture reverses the order: fasting does not purchase grace, it responds to a call of grace and expresses a heart already turned. Joel does not say “fast to bend God,” but “return to me with all your heart”—fasting is the outward garment of an inward conversion, and “rend your heart” counts infinitely more than “rend your garments”[13]. Without this interiority, the strictest fast is worth nothing: the Pharisee in the parable fasted twice a week and went down not justified, while it is the tax collector, who boasted of nothing, who “was made righteous”[14]. Saint John Cassian draws the conclusion clearly:
“It is therefore fitting to relate secondary things—fasts, vigils, retreat, and meditation on the Scriptures—to our principal goal, which is purity of heart, that is, charity.” — Saint John Cassian, Conferences, I[15] Fasting is not a merit to brandish, but a means to offer; not a lever on God, but a “yes” of the body to the grace that converts. To confuse the two is to believe oneself a creditor of God where one is only a beggar.
Errors about the place of fasting
“Fasting is only Lent — and Lent is giving up chocolate”
A very common reduction: fasting would be a seasonal matter, confined to the forty days of Lent, and even reduced in practice to “giving up chocolate” or social media. Outside Lent, nothing. This error is based on a real fact — Lent is indeed the high point of fasting — but it shrinks to one month what nourishes the entire Christian year.
The Church, in reality, makes Friday a weekly day of penance, in memory of the Lord’s death, and the Catechism recalls this double timing:
“The times and days of penance during the liturgical year (the season of Lent, every Friday in memory of the Lord’s death) are important moments of the Church’s penitential practice.” — Catechism of the Catholic Church, § 1438[16]
Strict fasting and abstinence are only obligatory on Ash Wednesday and Good Friday[17], but the duty of penance endures and far exceeds Lent[18]. As for “giving up chocolate,” that can be a good start — provided one does not forget that the chocolate fast only counts if it opens the way to prayer and sharing. The details of days, ages, and dispensations are treated in How to grow in fasting.
“Fasting is for monks and great saints, not for me”
Another narrowing, this time social: fasting would be a specialty of ascetics — desert monks, hermits, mystics with heroic fasts — admirable but out of reach and irrelevant for the ordinary Christian who works, raises children, eats in the cafeteria. “Those austerities are for them.”
But the Church has never reserved fasting for an elite: she makes it a precept binding on all the baptized. The Code of Canon Law is explicit about the universality of the obligation, while adapting it to ages:
“The law of abstinence binds those who have completed their fourteenth year; the law of fasting binds all adults up to the beginning of their sixtieth year.” — Code of Canon Law (1983), can. 1252[19]
The spectacular fasts of the saints are particular charisms, not the common measure; but the ordinary fast — that of Ash Wednesday, Good Friday, Fridays, small daily mortifications — is the ABC of every Christian, not a monastic extra. The form changes according to states of life; the call to fast, however, is for all.
“Fasting is sufficient in itself”
An error of isolation: one fasts and stops there, as if fasting were an autonomous work that would bear fruit on its own. One forgets that it is only one third of an inseparable whole. The Catechism places fasting alongside prayer and almsgiving as the three inseparable forms of conversion[20]. Saint Peter Chrysologus gave the most concise formula:
“There are three things, my brothers, by which faith stands firm: prayer, fasting, and mercy. […] Prayer strikes, fasting obtains, mercy receives. Prayer, fasting, and mercy are one and give life to each other: for fasting is the soul of prayer, and mercy the life of fasting. Let no one separate them: they do not know how to be divided.” — Saint Peter Chrysologus, Sermon 43[21]
A fast without prayer is just a diet; a fast without almsgiving withers. Hence the traditional image of the “two wings” of prayer: fasting and almsgiving carry it together toward God[22].
That is why Saint Leo the Great wants “our Christian fasts to be rich and abundant” — not in food, but in alms: “let each one give to the weak and the poor the delicate dishes he refuses himself.”[23] Fasting alone is a one-winged bird: it flaps, but it does not fly. The place of fasting in this triptych is developed in How to grow in fasting.
“Fasting is good — but only if it shows”
The error of Pharisaism, as old as fasting itself: one fasts, but arranges for it to be known — the downcast look, the slipped-in allusion, the displayed Lenten calendar. The deprivation becomes a display, and the reward sought is no longer God but the esteem of men. Christ precisely targets this charade:
“And when you fast, do not look gloomy like the hypocrites: they disfigure their faces to show others they are fasting. Truly I tell you, they have received their reward.” — Gospel according to Saint Matthew 6:16[24]
“They have received their reward”: the phrase is terrible. The displayed fast has already received its wage — the gaze of others — and expects nothing more from God. The parable of the Pharisee confirms it: he who “fasts twice a week” and proclaims it goes home not justified, while the tax collector returns reconciled[25]. The remedy is not to fast less, but to fast “in secret”[26]: wash your face, anoint your head, and leave it to God alone to see. On this mechanism of vain glory, see also Common errors concerning humility.
Errors about the requirement of fasting
"The more one fasts, the holier one is"
A symmetrical error to laxity, and much more pious in appearance: if fasting is good, then fasting more and more would be always better; the more austere would be the holiest. This is rigorism, which has caused as much damage in the history of the Church as laxity. It seduces because it seems heroic, demanding, generous.
But Tradition is unanimous: the criterion of true fasting is not quantity, it is measure. Saint Syncletica, mother of the desert, even goes so far as to say that there is an asceticism “dictated by the Enemy” — and that it is recognized by its excess:
“There is an asceticism dictated by the Enemy, and his disciples practice it. How then to distinguish the divine and royal asceticism from demonic tyranny? Clearly, by its quality of measure. […] Truly, lack of measure always corrupts.” — Saint Syncletica of Alexandria, Apophthegmata Patrum[27]
Fasting without measure is not a higher virtue: it is, in the words of Saint Bernard, a virtue turned into vice for lack of discretion[28]. Saint Catherine of Siena, who fasted to the extreme, receives from the Eternal Father this decisive warning: penance is only a means, never the foundation.
“Therefore I ask that the works of penance and other bodily exercises be employed as means, and that they not hold the principal place in affection.” — The Eternal Father to Saint Catherine of Siena, The Dialogue[29]
Making fasting an end, measuring one’s holiness by the number of privations, is precisely to invert the order God teaches Catherine: to take the means for the end, and risk feeding pride instead of starving it.
"Fasting harms health, so I abandon it"
Error of false discretion, the inverted mirror of the previous one. Because the Church recommends measure and dispenses the sick, one too quickly concludes that any deprivation is dangerous, and exempts oneself as a principle: “my body above all.” True discretion here becomes an alibi to never sacrifice anything.
Yet the Church carefully distinguishes legitimate dispensation from pretext. She truly exempts the sick, children, the elderly, pregnant or nursing women, those whose work demands their strength: on this point, Saint Francis de Sales is wise without rigorism.
“If the work you do is necessary for you, or very useful to the glory of God, I prefer that you suffer the pain of work rather than that of fasting. […] It is better to keep more bodily strength than is required, than to ruin more than is necessary.” — Saint Francis de Sales, Introduction to the Devout Life, III, 23[30]
But this indulgence aims at a real necessity, not comfort; and even exempted from food fasting, no one is exempt from penance, which can take a thousand other forms — a mortification of taste, a service, an alms. For Catherine of Siena, that the soul “abandons” its austerities “because of a necessity that arises” or “renounces them out of obedience at the order of its superior” is not a fault: “by continuing to engage in them, not only would it not merit, but it would sin”[31]. Discretion therefore does not abolish effort: it regulates it. Confusing the two is to exempt oneself from everything in the name of a wisdom that is only disguised laziness.
"The modern Church no longer requires fasting: Vatican II abolished it"
A historical error, very widespread: one observes that the fasts of old — the entire Lent on bread and water, the Ember Days, the vigils — have almost disappeared from common practice, and one concludes that the Church has “suppressed” fasting, or even that Vatican II abolished it. The de facto relaxation is taken for a de jure abolition.
This is false. In 1966, Paul VI reformed the penitential discipline by the apostolic constitution Paenitemini — he lightened it, never abolished it:
Paenitemini reaffirms the divine precept of penance, preserves Lent’s penitential character, establishes as obligatory days of penance for the whole Church all Fridays and Ash Wednesday (II, § 2), prescribes fasting and abstinence on Ash Wednesday and on the Friday of the Passion and Death of Christ (II, § 3), and entrusts to episcopal conferences the faculty to substitute for abstinence and fasting, in whole or in part, other forms of penance — notably works of charity and exercises of piety[32]. — Paul VI, Paenitemini, February 17, 1966
The duty of penance is of divine law: it does not depend on fashion and no reform can abolish it. What has changed is the form: fewer detailed prescriptions, more responsibility left to conscience. Ash Wednesday and Good Friday remain days of fasting and abstinence obligatory; all Fridays remain penitential[33]. The easing of the letter has not erased the spirit: it has entrusted it to our freedom — which, far from being a dispensation, is a higher demand.
"Fasting is useless: it is only a symbol"
The last error, the most radical: fasting would be an empty rite, religious folklore without real effect — a symbol that can be kept by tradition but that does not “do” anything. This is skepticism applied to asceticism: only the interior matters, and the body would have no part in spiritual combat.
But the Gospel attributes to fasting a proper efficacy in the fight against evil. Before a spirit that his disciples could not cast out, Jesus declares:
“This kind cannot be driven out by anything, except prayer.” — Gospel according to Saint Mark 9:29[34]
— the Vulgate (“nisi in oratione et ieiunio”) and many manuscripts, as well as the parallel in Matthew in the received textual tradition, add “and fasting”[35]. Fasting is therefore not an ornament: it is a weapon. Saint Paul compares the ascetic to the athlete who “treats harshly” his body so as not to be “disqualified”[36], and Saint Thomas recalls the three real effects of fasting: it restrains concupiscence, raises the spirit, satisfies for sin[37]. Benedict XVI sees in it “a spiritual weapon to combat all disordered attachments”[38]. Fasting does something precisely because man is not a pure spirit: what the body learns through hunger, the soul learns with it. Reducing it to a symbol is to forget that grace passes through the flesh — as it passed through that of the Word made flesh.
Error and Truth at a Glance
The table below summarizes the misunderstandings encountered: on the left, the common error; in the center, why it is false; on the right, what the Church actually teaches, with its source. It is read line by line, as a quick antidote to misconceptions.
| Common Error | Why It Is False | What the Church Teaches |
|---|---|---|
| Fasting is only about abstaining from food | True fasting involves the whole person, not just the mouth | “Let all the members fast” (Chrysostom); Is 58:6-7[39] |
| Fasting is a detox or a diet | Dietary fasting targets the body; Christian fasting targets God | Three ends: to restrain, to elevate, to satisfy (Thomas, II-II q. 147)[40] |
| Fasting means despising the body; it is sad | Fasting frees the body; it is a nuptial expectation, not mourning | “Anoint your head” (Mt 6:17); the Bridegroom (Mt 9:15)[41] |
| Fasting is earning God’s favor by one’s efforts | Fasting responds to grace; it does not purchase it | “Rend your hearts and not your garments” (Jl 2:13)[42] |
| Fasting is only for Lent | Friday is a penitential day all year; the spirit overflows Lent | CEC § 1438; Paenitemini[43] |
| Fasting is for monks, not for me | Fasting is a precept binding on all the baptized | Can. 1251-1252; fasting on Ash Wednesday and Good Friday[44] |
| Fasting is sufficient in itself | Without prayer and almsgiving, it withers | “The three are one” (Chrysologus); the two wings of prayer[45] |
| Fast so that it is visible | Public fasting has already received its reward | Fast “in secret” (Mt 6:16-18); the Pharisee (Lk 18)[46] |
| The more you fast, the holier you are | The measure, not the quantity, is the criterion | Remove discretion, “virtue becomes vice” (Bernard)[47] |
| Fasting harms health, so I abandon it | Dispensation is for real necessity, not comfort | Preserve strength “useful to the glory of God” (Francis de Sales)[48] |
| Vatican II abolished fasting | Paenitemini lightened, never abolished; duty of divine precept | Obligatory penance on Fridays and Ash Wednesday; Ash Wednesday and Good Friday maintained[49] |
| Fasting is useless, just a symbol | Fasting is a real weapon in spiritual combat | “This kind… except by prayer” (Mk 9:29)[50] |
Restoring True Joy to Fasting
Once the counterfeits are set aside, fasting appears in its true light. It is neither a diet, nor sadness, nor a bargaining chip, nor a performance, nor a relic: it is a language of love. The hungry body speaks to God a desire that words cannot always express; the empty stomach makes room in the person that grace comes to fill. “Man does not live by bread alone”[51]: fasting is tasting, through lack, the truth of this word.
True fasting is therefore, paradoxically, on the side of joy and not mourning. It lightens the heart of the thousand little attachments that weigh it down, it makes the soul light, available, “winged” for prayer[52]. It opens the hand to the poor, for voluntary hunger makes one understand involuntary hunger. It strengthens in the spiritual combat, for what the body learns to master, the will learns with it. Far from the gloom attributed to it, Christian fasting is a school of freedom: it makes the person master of what held him captive, so that he may finally be available to God and others.
That is why Tradition has never separated fasting from the heart. All the Church’s wisdom on this point is contained in Joel’s warning, repeated every Ash Wednesday: what God asks for is not first an empty stomach, but a broken and returned heart.
“Rend your hearts and not your garments, and return to the Lord your God, for he is gracious and merciful, slow to anger and abounding in steadfast love, relenting from punishment.” — Joel 2:13[53]
For further reading
- Why fast? — the reasons and purposes of fasting: why Christ fasts, why the Church fasts, what fasting accomplishes in the soul.
- How to grow in fasting — the practical guide: nature, distinctions (fasting, abstinence, mortification), current discipline, concrete means and fruits.
- What the saints say about fasting — a selection: the voices of the Fathers, desert monks, doctors, and mystics.
- Common errors concerning temperance — the cardinal virtue of which fasting is one of the acts, and its own misunderstandings.
- Common errors concerning detachment — the art of freely holding possessions, of which fasting is a school.
Notes and References
Catechism of the Catholic Church, § 1434: “The interior penance of the Christian can have very varied expressions. Scripture and the Fathers especially emphasize three forms: fasting, prayer, almsgiving (cf. Tb 12:8; Mt 6:1-18), which express conversion with regard to oneself, to God, and to others.” Official French edition, Mame/Plon, 1992; text rechecked against the official French archive on vatican.va on October 4, 2026.
1 20Gospel according to Saint Luke 4:1-2, official liturgical translation (AELF): “Jesus, full of the Holy Spirit, left the Jordan and was led by the Spirit into the wilderness, where for forty days he was tempted by the devil. He ate nothing during those days, and when they were over, he was hungry.” Foundation of the forty days of Lent.
2Gospel according to Saint Matthew 6:16-18, official liturgical translation (AELF), Gospel of Ash Wednesday: “And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces to show others they are fasting. Truly I tell you, they have received their reward. But when you fast, anoint your head and wash your face, so that your fasting may not be seen by others but by your Father who is in secret; and your Father who sees in secret will repay you.”
3 10 24 26Joel 2:12-13, official liturgical translation (AELF), read on Ash Wednesday: “And now—declares the Lord—return to me with all your heart, with fasting, weeping, and mourning! Rend your hearts, not your garments, and return to the Lord your God, for he is gracious and merciful, slow to anger, and abounding in steadfast love, relenting from punishment.”
4 13 42 53Saint Bernard of Clairvaux (1090-1153), Sermons on the Song of Songs, Sermon 49, § 5: “Discretio quippe omni virtuti ordinem ponit; ordo modum tribuit et decorem, etiam et perpetuitatem. […] est ergo discretio non tam virtus, quam quaedam moderatrix […]. Tolle hanc, et virtus vitium erit.” (“Discretion indeed sets order in every virtue; order gives measure and beauty, and even duration. […] Discretion is therefore not so much a virtue as a certain moderator […]. Remove it, and virtue will become vice.”) Latin text: PL 183, Sermones in Cantica, Sermon 49 (critical ed.: Sancti Bernardi Opera, Leclercq ed.). The phrase concerns discretio in general, moderator of all virtue; its application to fasting is a classical extension.
5 28 47Isaiah 58:6-7, official liturgical translation (AELF): “Is not this the fast that pleases me: to loose the bonds of injustice, to undo the thongs of the yoke, to let the oppressed go free, and to break every yoke? Is it not to share your bread with the hungry, and bring the homeless poor into your house; when you see the naked, to cover them, and not to hide yourself from your own kin?” A key text on the inseparability of fasting and justice toward the poor.
6Saint John Chrysostom (c. 349-407), Homilies on the Statues (Ad populum Antiochenum), Homily III, 11-12; PG 49; trans. NPNF, First Series, vol. 9 (the passage spans §§ 11 and 12): “Let not only the mouth fast, but also the eye, and the ear, and the feet, and the hands, and all the members of our body. Let the hands fast by remaining pure from robbery and greed. […] Let the mouth fast from shameful words and insults. For what profit is it to abstain from birds and fish if we bite and devour our brothers?” This famous exhortation comes from the third homily On the Statues, and not—as is often mistakenly read—from a “homily on fasting.” French translation based on the established English text.
7 39Saint Thomas Aquinas (1225–1274), Summa Theologica, II-II, q. 147, a. 1 (fasting is an act of virtue, belonging to abstinence, part of temperance): “Fasting is practiced for three purposes. First, to restrain the desires of the flesh […]. Second, so that the spirit may more freely rise to the contemplation of heavenly things; thus it is written (Dn 10) that Daniel received revelation after a three-week fast. Third, to make satisfaction for sins.” French translation of the respondeo (threefold purpose and Dn 10 reference verified against the text; reference ed.: Summa Theologiae, Éditions du Cerf).
8 37 40Benedict XVI, Message for Lent 2009 (December 11, 2008), on the theme “After fasting forty days and forty nights, he was hungry” (Mt 4:1-2): “Depriving oneself of the material food that nourishes the body facilitates the interior disposition to listen to Christ and to nourish oneself on his word of salvation. [...] fasting represents an important ascetic practice, a spiritual weapon to combat all disordered attachments. [...] fasting has as its ultimate goal to help each of us, as the Servant of God John Paul II wrote, to make a total gift of ourselves to God (cf. Veritatis splendor, 21).” Official French text rechecked word for word on vatican.va on October 4, 2026.
9 38Gospel according to Saint Matthew 9:14-15, official liturgical translation (AELF): “Then the disciples of John the Baptist came to Jesus and asked, ‘Why, when we and the Pharisees fast, do your disciples not fast?’ Jesus said to them, ‘Can the wedding guests mourn during the time when the bridegroom is with them? The days will come when the bridegroom is taken away from them; then they will fast.’” Christian fasting as a nuptial expectation.
11 41Saint Basil of Caesarea (c. 330-379), First Homily on Fasting (De ieiunio I), 7; PG 31, 164-184: “Fasting lifts prayer to heaven, serving it, so to speak, as a wing for its ascent.” French translation based on the established English text.
12 52Gospel according to Saint Luke 18:11-14, official liturgical translation (AELF): the Pharisee prays thus: “God, I thank you because I am not like other people […]. I fast twice a week and give a tenth of all I get.” — but it is the tax collector, not he, of whom Jesus declares: “when the latter went down to his house, it was he who had become righteous, rather than the other.” Fasting that feeds pride does not justify.
14 25 46Saint John Cassian (c. 360-435), Conferences, I (Conference of Abbot Moses on the purpose and end of the monk), ch. 7, Sources Chrétiennes 42 bis, Éditions du Cerf, 2008, p. 101 (French translation of the established text; substance verified against the English NPNF translation, the SC edition not being available online): “One gains less by fasting than one loses by a fit of anger; and the profit derived from reading does not equal the harm incurred by despising a brother. It is therefore fitting to relate secondary matters—fasting, vigils, retreat, and meditation on the Scriptures—to our principal goal, which is purity of heart, that is, charity.” Fasting is expressly subordinated here, as a means, to charity.
15Catechism of the Catholic Church, § 1438: “The times and days of penance during the liturgical year (the season of Lent, every Friday in memory of the Lord’s death) are important moments of the Church’s penitential practice (cf. SC 109-110; CIC, can. 1249-1253; CCEO, can. 880-883). These times are particularly appropriate for spiritual exercises, penitential liturgies, pilgrimages as a sign of penance, voluntary deprivation such as fasting and almsgiving, fraternal sharing (charitable and missionary works).” Official French edition, Mame/Plon, 1992; text rechecked against the official French archive on vatican.va on October 4, 2026.
16 43Code of Canon Law (1983), can. 1250-1253, in force (official French rechecked word for word on vatican.va on October 4, 2026; official English — “The law of fasting binds those who have attained their majority, until the beginning of their sixtieth year” — rechecked on vatican.va on October 4, 2026; cf. also Paenitemini, IV: “ad inceptum sexagesimum,” Latin rechecked on vatican.va on October 4, 2026): canon 1250 makes each Friday of the year and Lent the days and times of penance of the universal Church; canon 1251 prescribes abstinence from meat on all Fridays (except solemnities) as well as abstinence and fasting on Ash Wednesday and Good Friday; canon 1252 specifies: “Those who have completed their fourteenth year are bound by the law of abstinence; all adults up to the beginning of their sixtieth year are bound by the law of fasting.” Canon 1253 reserves to episcopal conferences the specification of this observance and the substitution, in whole or in part, of other forms of penance — notably works of charity and exercises of piety — for fasting and abstinence: any local adaptations fall under this faculty.
17 19 33 44Paul VI, apostolic constitution Paenitemini, February 17, 1966: reform of the Church’s penitential discipline. The text recalls the divine precept of penance, preserves Lent’s penitential character (II, § 1), establishes as obligatory days of penance for the whole Church “singulae sextae feriae totius anni et feria quarta Cinerum” (“all Fridays of the whole year and Ash Wednesday,” II, § 2), and prescribes fasting and abstinence on Ash Wednesday and on the Friday of the Passion and Death of Christ — “abstinentia vero et ieiunium, feria quarta Cinerum, vel, pro diversitate Rituum, primo die Magnae Quadragesimae, et feria sexta in Passione et Morte Christi Iesu” (II, § 3) — and entrusts to episcopal conferences the faculty to transfer these days and to substitute for abstinence and fasting, in whole or in part, other forms of penance, notably works of charity and exercises of piety (VI, § 1). Latin text rechecked word for word on vatican.va on October 4, 2026; cf. AAS 58 (1966), 177-198.
18 32 49Saint Peter Chrysologus (c. 380-450), Bishop of Ravenna and Doctor of the Church, Sermon 43 (PL 52, 320), read at the Lenten Office of Readings: “There are three things, my brothers, by which faith stands firm, devotion remains steadfast, and virtue perseveres: prayer, fasting, and mercy. […] Prayer strikes, fasting obtains, mercy receives. Prayer, fasting, and mercy are one, and give life to one another: for fasting is the soul of prayer, and mercy the life of fasting. Let no one separate them: they do not know how to be divided.” Translation from the Office of Readings (AELF).
21 45Traditional image of the “two wings” of prayer (fasting and almsgiving), often placed under the patronage of Saint Augustine: its exact wording is not found as such in the preserved works — neither in the Commentary on Psalm 42 (Enarrationes in Psalmos), nor in the Latin corpus consulted. The closest verifiable Augustinian passage, Sermon 58 on the Lord’s Prayer, § 10, gives the two wings another meaning: the two alms, that of the heart (forgiveness of offenses) and that of goods (shared bread) — “Do both, lest one wing be lacking to your prayer” (trans. Abbé Raulx, Œuvres complètes de saint Augustin, Bar-le-Duc, Guérin, 1866, vol. VI).
22Saint Leo the Great (Pope, † 461), Sermon 49 (on Lent, On Lent, XI), § VI; PL 54; trans. Charles Lett Feltoe, NPNF, Second Series, vol. 12: “In the distribution of alms and care for the poor, let our Christian fasts be rich and abundant; let each give to the weak and needy the delicacies he denies himself.” French translation based on the established English text.
23Saint Syncletica of Alexandria (4th century), Sayings of the Desert Fathers, alphabetical collection, Syncletica 15 (Greek text: Patrologia Graeca 65; English trans.: Benedicta Ward, The Sayings of the Desert Fathers: The Alphabetical Collection, Cistercian Publications): “There is an asceticism dictated by the Enemy, and his disciples practice it. How then to distinguish the divine and royal asceticism from demonic tyranny? Clearly, by its quality of measure. […] Always keep a single rule of fasting. […] Truly, lack of measure always corrupts.” French translation based on the established English text.
27The Eternal Father to Saint Catherine of Siena (1347-1380), The Dialogue, treatise on Discretion, ch. X: “Therefore I ask that the works of penance and other bodily exercises be employed as means, and that they not hold the principal place in affection.” (trans. J. Hurtaud, Téqui, Paris, 1913, verified word for word against the full text; same doctrine in ch. CIV of É. Cartier’s trans.: take penance “not as a principal end, but as an instrument of virtue”). Catherine, who fasted to extremes, teaches the subordination of penance to charity.
29Saint Francis de Sales (1567-1622), Introduction to the Devout Life, Part III, ch. 23 (“On the exercises of external mortification”): “If the work you undertake is necessary or very useful to the glory of God, I prefer that you suffer the hardship of the work rather than that of fasting. […] It is better to keep more bodily strength than is required than to ruin more than is necessary; for one can always reduce strength when one wishes, but one cannot always restore it when one wishes.” Boulenger edition (1909) after the 1619 text.
30 48The Eternal Father to Saint Catherine of Siena, The Dialogue, treatise on Discretion, ch. X (trans. J. Hurtaud, Téqui, Paris, 1913, verified word for word against the full text): “Sometimes the soul abandons them because of a necessity that arises and prevents it from completing the act begun, sometimes it renounces them out of obedience at the order of its superior, and henceforth, by continuing to engage in them, not only would it not merit, but it would sin.” (cf. É. Cartier’s trans., ch. CIV, § 4: “circumstances force the abandonment of austerities once begun”). Bodily penance must yield to obedience and necessity.
31Gospel according to Saint Mark 9:29, official liturgical translation (AELF), which here follows the critical text: “This kind cannot come out, except by prayer.” The reading “and fasting” (Greek καὶ νηστείᾳ; Latin et ieiunio — “hoc genus in nullo potest exire nisi in oratione et ieiunio”) is widely attested in the later manuscript tradition (Byzantine text) and in the Vulgate; it is lacking, by contrast, in the oldest Greek witnesses, which explains its absence from modern critical editions and from the AELF. The parallel in Mt 17:21 (“but by prayer and fasting”) itself belongs only to the received tradition and is lacking in the oldest witnesses. Whatever the textual criticism, the association of prayer and fasting in spiritual combat is unanimous in Tradition.
34 35 50First Letter to the Corinthians 9:25-27, official liturgical translation (AELF): “All athletes in training impose a severe discipline on themselves; they do it to receive a laurel crown that will fade, and we, for a crown that will not fade. […] I treat my body harshly, I make it my slave, lest, after preaching the Gospel to others, I myself should be disqualified.” Pauline image of asceticism as the training of the athlete.
36Gospel according to Saint Matthew 4:3-4, official liturgical translation (AELF): “The tempter came and said to him, ‘If you are Son of God, command these stones to become loaves of bread.’ But he answered, ‘It is written, Man shall not live by bread alone, but by every word that proceeds from the mouth of God.’” (quoting Dt 8:3). Christ repels temptation in the midst of his fast by the Word.
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