The Church Fathers on this verse

Mark 9:28Meaning & Commentary from the Church Fathers

And he said to them: This kind can go out by nothing, but by prayer and fasting.

Douay-Rheims

και εισελθοντα αυτον εις οικον οι μαθηται αυτου επηρωτων αυτον κατ ιδιαν οτι ημεις ουκ ηδυνηθημεν εκβαλειν αυτο

Greek (Byzantine text)

The Church Fathers on this verse

8 Church Fathers comment on this verse

Theophylact of Bulgaria

11th centuryChurch Father

‘This kind.’ What kind is being referred to? It pertains to the type of demoniacs that appear each new month, or more broadly, to the entire category of demons that cannot be driven out save through prayer and fasting. It is essential for both the individual afflicted by these demons and the one seeking to heal them to fast; indeed, fasting is especially crucial for the afflicted. Moreover, it is not sufficient to fast alone; prayer must accompany fasting, and vice versa. True prayer is realized when it is paired with fasting; when the person praying is not weighed down by food, prayer becomes more effortless and sincere.

Jerome of Stridon

4th centuryChurch Father

The Lord exemplified fasting for forty days following His baptism, illustrating that the most formidable demons can only be expelled through prayer and fasting.

Gregorios Palamas

14th centuryChurch Father

On these sacred occasions, while I have discussed fasting and prayer with you, my cherished ones, I have yet to truly unveil the significance of the gifts bestowed upon those who engage in these practices and the immense blessings that accompany them. It is a profound matter—a discovery of great magnitude. Among the numerous benefits, fasting and prayer provide strength to overcome evil spirits, enabling the casting out and banishing of those who are tormented by them. When the Disciples asked the Lord, "Why could we not cast it out?" He responded, "This kind can only be cast out by prayer and fasting" (Matthew 17:19, 20). Following this, after praying atop a mountain and witnessing a glorious transfiguration, He descended to the spot where the afflicted man was found.

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Taking His chosen Disciples with Him, He ascended the mountain, praying as He radiated like the sun. Then, behold, Moses and Elijah appeared to Him—perhaps the most revered figures in prayer and fasting—engaging in conversation with Him. Their presence during His prayer illustrated the profound connection between prayer and fasting, as one seemingly conversed with the other, each enhancing the other’s essence.

The scriptural account highlights that if even the blood of the slain Abel cries out to the Lord, how much more will the very essence of those who have endured the trials of fasting cry out to Him? Each part of the body that has suffered in obedience will advocate for those who fast and pray sincerely, enhancing the effectiveness of their supplication. Having illuminated the disciples with divine radiance following His prayer, Christ approached the people, demonstrating that the rewards of fasting and prayer extend beyond mere illumination to include liberation from demon possession. Some may argue that the afflicted must engage in prayer and fasting themselves. However, it is implausible for a heavily possessed individual to benefit spiritually under such overwhelming influence. Thus, the demon tormenting him was one of unrestrained lust, ensnaring him in fire and water—symbolic of his tumultuous emotions driven by base desires and indulgences. Those whom such a deaf and mute demon possesses often find it difficult to connect with sacred truths.

Yet, the unpossessed individual, albeit influenced, retains self-control and can strive for conversion through the practices of prayer and fasting, which offer the means to discipline the body and quell its urges while still actively resisting the only onslaughts that the Evil One would stir. When a person is beyond the point of merely being influenced and is entirely possessed, the efforts of spiritually gifted individuals, empowered by the Holy Spirit, become pivotal for his liberation. However, casting out demons is not the sole pursuit, for external signs hold no merit if one's life remains careless, as Christ warns: "Many will say to Me in that day, ‘Lord, did we not prophesy in Your name, and in Your name cast out demons?’ And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness’” (Matthew 7:22, 23). It is far more advantageous to cleanse the soul of vices such as lust, anger, hatred, and pride than to merely expel demonic entities. Addressing alone the physical sins fails to purify the internal workings of the soul.

Evil thoughts—adultery, fornication, murder, theft, greed—originate from within the heart, leading humanity astray. Even as Christ stipulates, “Whoever looks at a woman to lust for her has already committed adultery with her in his heart” (Matthew 5:28), which demonstrates that inward sin can occur even when the body is passive. Conversely, when the soul engages in prayer, sobriety, remembrance of death, godly sorrow, and heartfelt mourning, it becomes fortified against temptation. This aligns precisely with the Lord’s teaching that it is not enough to merely cleanse the exterior but to also purify the heart within: “First cleanse the inside of the cup and dish, that the outside of them may be clean also” (Matthew 23:26).

If we dedicate ourselves to aligning our inner lives with God's standards, we will overcome external passions. As articulated by Paul, “Walk in the Spirit, and you will not fulfill the lust of the flesh” (Galatians 5:16). Christ did not abolish Jewish circumcision; rather, He fulfilled it, stating, “I did not come to destroy the Law but to fulfill it” (Matthew 5:17). He fulfilled the law by addressing the circumcision of the heart—an internal act that the Jews neglected. The Prophets condemned them for being uncircumcised in heart, which God's scrutiny of our inner being reveals. “For man looks at the outward appearance, but the Lord looks at the heart” (1 Samuel 16:7). A heart filled with wickedness leaves one worthy of divine rejection.

Therefore, the Apostle urges us to pray without anger and doubt, prompting our focus on spiritual circumcision of the heart. The Lord lauds those who possess purity of heart, promising that they shall "see God." He blesses the poor in spirit, coming alongside those who, through genuine humility and goodwill, forgo their desires for external materialism. He admonishes against not only murder but also wrath, insisting on heartfelt forgiveness toward those who offend us, rejecting any offerings if unresolved anger persists. Regarding physical desires, He denounces even the act of lustful glances as equivalent to adultery. By comprehensively addressing this, Christ refers to the inner intellect when He states, “If the light that is in you is darkness, how great is that darkness!” (Matthew 6:23). Therefore, when our inner thoughts remain clear of carnal influences, our souls shine brightly as a lamp radiates light.

This genuine spiritual circumcision of the heart is what Christ accomplished, replacing the outward fleshly sign given to the Jews. For those neglecting this inner change, their physical circumcision becomes meaningless, as Paul notes, and they find themselves estranged from God, who seeks the true state of the heart rather than mere external appearances. Thus, I implore you, brethren, to strive ardently, cleansing our hearts from all moral dirt to avoid aligning with the condemned. If the law delivered by Moses was steadfast, punishing every offense and disobedience, how then shall we evade judgement if we disregard our salvation, which was first proclaimed by the Lord and substantiated in us through miraculous signs and diverse wonders accompanied by the Holy Spirit, as attested by God (Hebrews 2:2-4)?

Let us stand in reverence before the One who scrutinizes our innermost thoughts. Let us beseech the Lord who avenges; may peace, holiness, and sincere prayer find a dwelling within us, for “without which no one will see the Lord." Let us earnestly desire through steadfast faith the promised vision of God for the pure in heart, doing all we can to obtain it, for it brings eternal life, genuine beauty, immeasurable wealth, unchanging delight, and everlasting glory and kingdom, which may we all inherit in Christ, the eternal King, to whom all glory, honour, and worship are due, with His Father, who has no beginning, and the Most Holy and Blessed Spirit, forever and ever. Amen.

Philaret of Moscow (Drosdow)

19th centuryChurch Father

He spoke to them, saying, “This generation cannot be freed except through prayer and fasting” (Mark 9:29). In alignment with the traditions of the Church, which are honored by examples, guidelines, and long-standing practices, we now embark on a season of fasting. To navigate this journey with grace and integrity, it is essential that we kindle our spirits and contemplate the purpose of our calling in this endeavor, as well as the significance, dignity, power, and intent of the challenge set before us. The Gospel reading for today invites us to ponder these very thoughts. This celebration is not overshadowed by the Lenten message, as it honors the practice of fasting, acknowledging it in part while also preserving the essence of the observance.

If the spiritual virtues adorning this day stem from the Most Holy and Blessed Virgin Mary, it is important to recognize that the virtue of fasting is also a part of this celebration. Consider the pious tradition that recounts an angel bringing nourishment to the Most Holy Virgin during her time in the Temple at Jerusalem. The Scriptures remind us, “Are they not all ministering spirits sent forth to serve those who will inherit salvation?” (Hebrews 1:14), illustrating how heavenly messengers do not descend to our dark realm without purpose. Those who do not fast tend to focus on earthly sustenance, seeking not only what is necessary but also what is abundant and pleasurable, and therefore find no need for angelic support. However, for one who renounces the desires of the flesh to draw closer to the incorporeal, the incorporeal likewise draws near in return, reminding the diligent observer that when the limits of physical frailty are reached, they are provided with supernatural nourishment when they need it most.

Thus, the angel’s provision for the Blessed Virgin illustrates her commitment to fasting. The traditions recounted by Blessed Jerome and Saint Demetrius detail how she structured her daily life and when her fasting would come to an end: “From morning until the third hour, she stood in prayer; from the third hour until the ninth hour, she engaged in needlework or reading. Beginning from the ninth hour, she resumed her prayer, a practice she maintained until the angel appeared to her, when she received her sustenance from his hands” (Chet. Min. Noemvr. 21).

Now let us return to the central question: What is the purpose of fasting? We can arrive at the answer by asking reverse questions: Why did the Blessed Virgin Mary observe a daily fast until evening? Why did Moses fast three times for forty days on Sinai? Why did Elijah fast for forty days on his journey to Horeb? Why was the life of John the Baptist characterized by an ongoing, profound fast? What motivated Adam to fast in paradise? And why did our Lord Jesus Christ Himself fast for forty days in the wilderness? The Apostolic guidelines (69) state that those who “do not fast during the holy days leading up to Easter, or on Wednesdays or Fridays, except for reasons of physical infirmity,” are to be excommunicated. The very existence of these questions implies a strong answer to the initial inquiry about fasting’s importance. The examples of these figures demonstrate that fasting carries great significance, dignity, and power and is essential for achieving lofty spiritual aspirations.

Let us contemplate the question of the Blessed Virgin Mary’s daily fasting. It is not appropriate to suggest that she fasted with the intention of preparing for her exalted role as the Mother of the Lord, for at the time she entered her fast, this mystery had not yet been revealed to her. However, it is clear that her fasting was, according to divine providence, a true preparation for her role. Whether her fasting arose from her desire for the spiritual or was influenced by the guidance of her guardian angel, it was surely not by mere chance but through deliberate intention for her participation in the divine mystery of the Incarnation. Her example remains unique and unmatched. From this, we can conclude that if the Blessed Virgin Mary’s perfect commitment to fasting was necessary on her path to divine favor, then our own, albeit imperfect, fasting can be essential and beneficial in our common journey toward grace as true Christians.

In contemplating Moses’ forty-day fast on Sinai, we find that the sacred texts reveal he fasted first to receive the Law from God, then to plead for mercy on behalf of the people when he saw their idolatry, and lastly to seek a profound vision of God and receive the new tablets of the Law and Covenant to replace those that were broken. While we might not be able to replicate such an extraordinary feat, we can draw meaningful lessons from it. If Moses’ extended fast aided him in obtaining the Law for the Hebrew people, which in turn benefited all of humanity, then our fasting, however modest, may help us gain a deeper understanding of God’s law for ourselves; for, contrary to common belief, an overly full stomach is not conducive to true learning, either physical or spiritual.

If Moses’ fast, combined with prayer, served as a powerful intercession for the forgiveness of the grievous sins of an entire nation, might not our own sincere fasting serve as a means of intercession for our own sins? If Moses’ lengthy fast led him to a remarkable vision of God, which is experienced only by those who dwell in the flesh, could not our achievable fast, by freeing our hearts from the burdens of the flesh, prepare us for the beginnings of divine sensations?

What, then, was the purpose of Elijah’s forty-day fast on his journey to Horeb? This may seem an act of necessity due to the circumstances of traveling through desolate regions. However, the angel indicated that it was not random but rather part of a divine order. The prophet, after embarking on a day’s journey into the wilderness without food, fell asleep, and it was there that the angel of the Lord awoke him, urging him to eat and drink. The prophet partook of the angel’s simple sustenance of unleavened bread and water, which was not typical for a one observing a fast. The angel communicated that he would need to strengthen himself for a longer journey ahead, noting the need for sustenance in light of the forthcoming fasting.

Elijah’s journey lasted for forty days, mirroring Moses’ experience, and ultimately led to a miraculous vision of God. Thus, fasting in the context of Elijah signifies not only a voluntary act of the prophet but also a response to divine direction. It is evident that there is a Heavenly necessity for fasting when approaching God.

Consider the wise words: “the corruptible body burdens the soul” (Proverbs 9:15). Therefore, when is the soul more capable of ascending to the divine and connecting with the heavenly realm? Is it when it is weighed down by excess or when it is refined and lightened through mindful deprivation?

What motivated John the Baptist to lead a life of stringent fasting? He was not compelled but rather drawn by an inherent inclination known even before his birth, foretold in regard to his significance: “He shall be great before the Lord, and he will drink neither wine nor strong drink” (Luke 1:15). The angel’s instruction to John to abstain from wine implies that such indulgence could diminish the stature of this greatest among those born of women, and thus called for fasting as a means of preparing him for the high calling of being the Christ’s forerunner and the baptizer of the incarnate Son of God. Is there not something to be learned from such an extraordinary example?

To extend a mortal hand and touch the head of the incarnate Son of God while the Holy Spirit visibly descends upon Him, John must have been profoundly purified to withstand the divine presence. Do we not also have the opportunity to approach Christ? Consider whether it is unnecessary to prepare ourselves for this divine communion through a life of fasting and prayer. Is it not reasonable that the Church calls us to prepare for this holy Sacrament through fasting, albeit modestly and for only a limited time?

Now let us address the most crucial inquiries: Why did Adam fast in Paradise? Why did Christ fast for forty days in the desert? If there is uncertainty regarding Adam’s fast, recall that the command to sustain oneself solely on the plants of the earth and to abstain from meat and fish was given to him as a constant rule during his earthly existence. Moreover, there was a distinctive commandment barring him from partaking of the tree of knowledge, both good and evil (Gen. 2:17). The significance of adhering to such a commandment undoubtedly fortified Adam in the path of celestial life. However, succumbing to temptation and transgressing this divine command resulted in a greater predominance of the sensual over the spiritual, leading to his fall from paradise and the earthly life; a fate that would have befallen all his descendants, if not for the intervention of the Son of God, who became incarnate and provided humanity another opportunity for spiritual triumph amidst trials unknown to Adam.

Thus, the failure of the first Adam to observe a simple fast in paradise necessitated the rigorous fast of the second Adam on earth, as He resisted the overwhelming tempter. “Jesus was led by the Spirit into the wilderness, and was tempted by the devil for forty days, and did not eat anything during that time” (Luke 4:1-2).

Christians, remember that “Christ suffered for us, leaving us an example that we should follow in His steps” (1 Pet. 2:21). Given all this, can we still question the purpose of fasting? It exists because “Christ has left us the model of fasting, that we may emulate His example.” Just as Christ’s fast was a part of His divine mission for the salvation of humanity, our fasting must also connect to our acts of faith for our own salvation. Therefore, it is no surprise that the early Church established fasting as a fundamental practice, linking it with the spiritual life, exhorting those unwilling to engage in fasting, barring illness, as unworthy of communion.

I could elaborate upon the acts of fasting displayed by the Holy Monks and Saints throughout time, who, in pursuit of an even stricter observance, exemplified feasts resembling the fasts of Elijah and John. Their wisdom, miraculous lives, and beatific holiness bear witness to the righteous beginnings and fruitful outcomes of their sacred endeavors.

The significance of fasting is highlighted through an incident in the Gospel. After the Lord conferred upon the Apostles the power to expel demons and heal the afflicted (Luke 9:1), they found themselves unable to liberate a mute man possessed by a tormenting spirit until Jesus intervened. When they inquired why they could not perform the exorcism, the Lord replied, “This kind can come out by nothing, but by prayer and fasting” (Mark 9:29). This emphasizes the profound value of combining fasting with prayer. Although the Lord did not initially require the Apostles to fast, He postponed that expectation until His passion. “Can the sons of the bridechamber fast while the bridegroom is with them? But the days will come, when the bridegroom shall be taken away from them, and then they shall fast in those days” (Luke 5:34). The Apostles were able to perform miracles without strict fasting since they acted with the authority granted to them, but they soon recognized that greater power was necessary to combat the stronger forces of evil.

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Alexander Gorsky

19th centuryCommentator

Later, in private, His disciples inquired why they were unable to expel the demon. The Lord clarified that their failure stemmed from a lack of faith and, additionally, from an absence of prayer and fasting. Fasting is essential for fortifying prayer.

Gladkow B.I.

19th centuryCommentator

Jesus proceeded to clarify to His disciples the reasons behind their inability to heal, indicating that alongside robust faith, both fasting and prayer are essential to perform miracles similar to the one He had just accomplished: fasting being a means to free oneself from worldly attachments, and prayer as a way to seek God's unique assistance, for this kind does not go out except by prayer and fasting (Matthew 17:21). The Apostles lacked the necessary faith to perform miracles and did not turn to God through prayer and fasting. The father of the afflicted boy, lacking faith yet desiring to believe, contributed to the healing's failure.

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It seems the Lord referred to the evil spirit as mute and deaf not because it inherently was so, but due to the boy's condition under its influence, which rendered him mute and deaf. Thus, the phrase "this generation" refers not to the malevolent spirit but rather to the boy, who could not comprehend the Apostles' intentions when they approached, and consequently lacked faith in the possibility of his healing. We know that Jesus expected faith from those He healed, as this belief in His divine power was a prerequisite for restoration. Although He did heal some who could not express their faith, such as those who were unresponsive or absent during their illness, in most cases, He required faith from those seeking healing. While Christ could heal unbelievers, as all things are possible for Him, the question arises: Is it achievable for the Apostles? Yes, Christ affirms; however, it necessitates earnest effort on their part, a profound plea for divine assistance, requiring a prayer with unyielding power, undiluted by earthly concerns, and a commitment to strict fasting. The boy, having no awareness or understanding of Jesus, could not possess faith in Him and exemplified a type of afflicted individual whose healing demands unique endeavors, efforts that the Apostles did not implement, resulting in their inability to heal him.

Lopuchin A.P.

19th centuryCommentator

He explained to them directly that their lack of faith was the root of the issue. It is possible that the awareness of His absence had diminished their trust, or that they felt less equipped to face challenges without Peter and the sons of Zebedee at their side. Additionally, the heartbreaking news of their Master's rejection and crucifixion may have deeply affected the most vulnerable among them. Regardless, He seized this opportunity to impart two significant lessons: first, that some forms of spiritual, physical, and moral afflictions are so powerful and entrenched that they can only be overcome through prayer coupled with self-discipline and renunciation, with fasting being the most potent method; second, that with perfect faith, nothing is impossible. Even faith as small as a mustard seed has the capacity to enact miracles. Those who possess such faith can command a mountain to relocate and cast itself into the sea, and it will indeed happen.

Paul Matwejewski

19th centuryCommentator

Afterward, Jesus Christ and His disciples went into the house, where they had a private discussion with Him, asking, “Why were we unable to cast him out?” As the blessed Theophylact notes, the apostles were concerned that they might have lost the authority they had been given over demons, prompting them to approach Jesus with apprehension. In response to their doubts, the Lord stated, “Amen I say to you: if you have faith, as the grain of a mustard seed, you shall say to this mountain, ‘Pass from here to there,’ and it shall pass; and nothing shall be impossible for you.” This powerful imagery illustrates how faith takes root within the human heart, starting as something minuscule, yet it can grow to become immensely powerful, rendering the impossible achievable. According to St.

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John Chrysostom, the apostles did not consistently possess such unwavering faith; at times, they faltered, as “before the cross, they were not entirely perfect.” They struggled to drive out the evil spirit, for as the Lord clarified, this kind can only be cast out through prayer and fasting. “He who prays with fasting has two wings, the lightest winds—he is swifter than fire and ascends above the earth; hence, this individual becomes a formidable adversary against demons, for there is no stronger person than one who prays earnestly” (St. John Chrysostom).

Cross references

Passages read together with this verse.

The original text

Greek text, 18 words with lemma, transliteration and Strong’s number. Tap to expand.

  1. Καὶ
    kai
    and
    G2532 · καί
  2. εἰσελθόντος
    eiselthontos
    I go in
    G1525 · εἰσέρχομαι
  3. αὐτοῦ
    autou
    he
    G846 · αὐτός
  4. εἰς
    eis
    into
    G1519 · εἰς
  5. οἶκον
    oikon
    a house
    G3624 · οἶκος
  6. οἱ
    hoi
    the
    G3588 · ὁ
  7. μαθηταὶ
    mathētai
    a learner
    G3101 · μαθητής
  8. αὐτοῦ
    autou
    he
    G846 · αὐτός
  9. κατ᾽
    kat
    down from
    G2596 · κατά
  10. ἰδίαν
    idian
    one's own
    G2398 · ἴδιος
  11. ἐπηρώτων
    epērōtōn
    I interrogate
    G1905 · ἐπερωτάω
  12. αὐτόν
    auton
    he
    G846 · αὐτός
  13. Ὅτι
    hoti
    that
    G3754 · ὅτι
  14. ἡμεῖς
    hēmeis
    I
    G1473 · ἐγώ
  15. οὐκ
    ouk
    no
    G3756 · οὐ
  16. ἠδυνήθημεν
    ēdynēthēmen
    I am powerful
    G1410 · δύναμαι
  17. ἐκβαλεῖν
    ekbalein
    I throw
    G1544 · ἐκβάλλω
  18. αὐτό
    auto
    he
    G846 · αὐτός