The Monastic Pint Answers from church history on today's questions

How to fast

What Christian writers said, from about AD 100 to 1918.

57 passages · 35 writers · 12 centuries

The short answer

Writers say a fast is more than going without food: it goes with turning from sin and with a humble, sincere heart, and fasting for display or for merit is rejected. Calvin names three ends of a holy fast: to subdue the flesh, to prepare for prayer and meditation, and to show humility and confess guilt before God; Aquinas and Manning give similar ends. Augustine, Leo the Great, and Bayly join fasting to prayer and almsgiving, and Hermas and Bayly say to give the poor what the day's food would have cost. On what to give up and how much, Jerome, Calvin, and de Sales urge measure and warn against extremes, Luther says to measure the fast by the lust it is meant to subdue, and Chrysostom says the eyes and feet must fast too. Calvin says fasting is indifferent in itself and not a meritorious worship, and the Second Helvetic Confession says every fast should come from a free and humbled spirit.

With what mind to fast

17 passages · 14 writers · 1st c. to 1900s

Leo the Great, Chrysostom, Cassian, Hermas, and Calvin say the fast belongs to the heart: turn from sin, be humble, and do not fast for display or merit.

c. 100–150 · Hermas, The Shepherd of Hermas sim5.1

Listen,” he continued: “God does not desire such an empty fasting. For fasting to God in this way you will do nothing for a righteous life; but offer to God a fasting of the following kind: Do no evil in your life, and serve the Lord with a pure heart: keep His commandments, walking in His precepts, and let no evil desire arise in your heart; and believe in God. If you do these things, and fear Him, and abstain from every evil thing, you will live unto God; and if you do these things, you will keep a great fast, and one acceptable before God.”

440–461 · Leo the Great, Sermons (Tractatus) 19.2

Since therefore all vices are destroyed by self-restraint, and whatever avarice thirsts for, pride strives for, luxury lusts after, is overcome by the solid force of this virtue, who can fail to understand the aid which is given us by fastings? for therein we are bidden to restrain ourselves, not only in food, but also in all carnal desires. Otherwise it is lost labour to endure hunger and yet not put away wrong wishes; to afflict oneself by curtailing food, and yet not to flee from sinful thoughts. That is a carnal, not a spiritual fast, where the body only is stinted, and those things persisted in, which are more harmful than all delights.

1559 · John Calvin, Institutes of the Christian Religion 4.12.19

But the first thing always to be avoided is, the encroachment of superstition, as formerly happened, to the great injury of the Church. It would have been much better to have had no fasting at all, than have it carefully observed, but at the same time corrupted by false and pernicious opinions, into which the world is ever and anon falling, unless pastors obviate them by the greatest fidelity and prudence. The first thing is constantly to urge the injunction of Joel, “Rend your heart, and not your garments” (Joel 2:13); that is, to remind the people that fasting in itself is not of great value in the sight of God, unless accompanied with internal affection of the heart, true dissatisfaction with sin and with one’s self, true humiliation, and true grief, from the fear of God; nay, that fasting is useful for no other reason than because it is added to these as an inferior help. There is nothing which God more abominates than when men endeavour to cloak themselves by substituting signs and external appearance for integrity of heart. Accordingly, Isaiah inveighs most bitterly against the hypocrisy of the Jews, in thinking that they had satisfied God when they had merely fasted, whatever might be the impiety and impure thoughts which they cherished in their hearts.

What fasting is for

11 passages · 11 writers · 1200s to 1900s

Calvin, Aquinas, Manning, and Murray give the ends of fasting: subduing the flesh, aiding prayer, humbling oneself, and sympathy with the suffering.

1265–1273 · Thomas Aquinas, Summa Theologica II-II, q. 147, a. 1, co.

First, in order to bridle the lusts of the flesh, wherefore the Apostle says (2 Cor. 6:5,6): "In fasting, in chastity," since fasting is the guardian of chastity. For, according to Jerome [*Contra Jov. ii.] "Venus is cold when Ceres and Bacchus are not there," that is to say, lust is cooled by abstinence in meat and drink. Secondly, we have recourse to fasting in order that the mind may arise more freely to the contemplation of heavenly things: hence it is related (Dan. 10) of Daniel that he received a revelation from God after fasting for three weeks. Thirdly, in order to satisfy for sins: wherefore it is written (Joel 2:12): "Be converted to Me with all your heart, in fasting and in weeping and in mourning." The same is declared by Augustine in a sermon (De orat. et Jejun. [*Serm. lxxii (ccxxx, de Tempore)]): "Fasting cleanses the soul, raises the mind, subjects one's flesh to the spirit, renders the heart contrite and humble, scatters the clouds of concupiscence, quenches the fire of lust, kindles the true light of chastity."

1559 · John Calvin, Institutes of the Christian Religion 4.12.15

A holy and lawful fast has three ends in view. We use it either to mortify and subdue the flesh, that it may not wanton, or to prepare the better for prayer and holy meditation; or to give evidence of humbling ourselves before God, when we would confess our guilt before him.

1885–1895 · Andrew Murray, With Christ in the School of Prayer 13

Sorrow and anxiety cannot eat: joy celebrates its feasts with eating and drinking. There may come times of intense desire, when it is strongly felt how the body, with its appetites, lawful though they be, still hinder the spirit in its battle with the powers of darkness, and the need is felt of keeping it under. We are creatures of the senses: our mind is helped by what comes to us embodied in concrete form; fasting helps to express, to deepen, and to confirm the resolution that we are ready to sacrifice anything, to sacrifice ourselves, to attain what we seek for the kingdom of God. And He who accepted the fasting and sacrifice of the Son, knows to value and accept and reward with spiritual power the soul that is thus ready to give up all for Christ and His kingdom.

Joined to prayer and almsgiving

16 passages · 14 writers · 1st c. to 1800s

Augustine, Leo the Great, Bayly, Hermas, and Chrysostom say fasting goes with prayer and with giving to the poor.

c. 390 · John Chrysostom, Homilies on the Gospel of Matthew 77.6

And after these virtues let us seek, which together with our own salvation will be able in the greatest degree to profit our neighbor. Such is almsgiving, such is prayer, or rather even this latter is by the former made efficacious, and furnished with wings. “For thy prayers,” it is said, “and thine alms are come up for a memorial before God.” But not prayers only, but fasting also hath its strength from hence. Shouldest thou fast without almsgiving; the act is not so much as counted for fasting; but such a one is worse than a gluttonous man and a drunkard; and so much worse, as cruelty is a more grievous thing than luxury.

c. 392–422 · Augustine of Hippo, Expositions on the Psalms (Enarrationes in Psalmos) 43.7

Do it then from the heart: that He “who seeth in secret,” may say, “whilst thou art yet speaking, Here I am.” How speedily are the prayers of those received, who work righteousness! And this is man’s righteousness in this life, fasting, alms, and prayer.

c. 1611 · Lewis Bayly, The Practice of Piety 13

As, therefore, Christ joined fasting, prayer, and alms together in precept, so must thou join them together, like Cornelius, in practice. And therefore be sure to give at the least so much to the poor, on thy fasting day, as thou wouldst have spent in thine own diet, if thou hadst not fasted that day. And remember, that “he that soweth plenteously shall reap plenteously” (2 Cor. ix. 6), and that this is a special sowing day. Let thy fasting so afflict thee, that it may refresh a poor Christian; and rejoice that thou hast dined and supped in another; or rather, that thou hast feasted hungry Christ, in his poor members.

What to give up and how long

13 passages · 11 writers · 200s to 1800s

Jerome, Calvin, Luther, de Sales, and Chrysostom say what to abstain from, how much, and for how long.

c. 370–419 · Jerome, Letters 52.12

Lay upon yourself only as much fasting as you can bear, and let your fasts be pure, chaste, simple, moderate, and not superstitious. What good is it to use no oil if you seek after the most troublesome and out-of-the-way kinds of food, dried figs, pepper, nuts, dates, fine flour, honey, pistachios? All the resources of gardening are strained to save us from eating household bread; and to pursue dainties we turn our backs on the kingdom of heaven.

1559 · John Calvin, Institutes of the Christian Religion 4.12.18

But that there may be no error in the name, let us define what fasting is; for we do not understand by it simply a restrained and sparing use of food, but something else. The life of the pious should be tempered with frugality and sobriety, so as to exhibit, as much as may be, a kind of fasting during the whole course of life. But there is another temporary fast, when we retrench somewhat from our accustomed mode of living, either for one day or a certain period, and prescribe to ourselves a stricter and severer restraint in the use of that ordinary food. This consists in three things—viz. the time, the quality of food, and the sparing use of it. By the time I mean, that while fasting we are to perform those actions for the sake of which the fast is instituted. For example, when a man fasts because of solemn prayer, he should engage in it without having taken food. The quality consists in putting all luxury aside, and, being contented with common and meaner food, so as not to excite our palate by dainties. In regard to quantity, we must eat more lightly and sparingly, only for necessity and not for pleasure.

1608 · Francis de Sales, Introduction to the Devout Life 3.23

I am prepared to say with S. Jerome (to the pious Leta) that I disapprove of long and immoderate fasting, especially for the young. I have learnt by experience that when the colt grows weary it turns aside, and so when young people become delicate by excessive fasting, they readily take to self-indulgence. The stag does not run with due speed either when over fat or too thin, and we are in peril of temptation both when the body is overfed or underfed; in the one case it grows indolent, in the other it sinks through depression, and if we cannot bear with it in the first case, neither can it bear with us in the last. A want of moderation in the use of fasting, discipline and austerity has made many a one useless in works of charity during the best years of his life, as happened to S. Bernard, who repented of his excessive austerity. Those who misuse the body at the outset will have to indulge it overmuch at last. Surely it were wiser to deal sensibly with it, and treat it according to the work and service required by each man’s state of life.