Isaiah 66:15Meaning & Commentary from the Church Fathers

He affirms that the actions of those who refuse to heed Him will bear consequences. He proclaims that His arrival will be as fierce as fire. Those dwelling in the new Zion, that is, within the Church, have been reassured of unparalleled comfort, the grant of spiritual blessings, the resurrection from the dead, and the eminent glory that awaits them; yet He asserts that any act of disobedience will not escape punishment: He will descend from heaven in the radiance of His Father, accompanied by His holy angels, as stated in Matthew 16:27. His chariot, as described in the Psalms, reflects that the chariot of God is a shadow for those who walk in darkness, as a thousand prodigious forces (Psalm 67:18). He shall come to enact vengeance with great wrath, returning in flames of fire. This retribution signifies rejection, as He will declare to those who have died in sin: Depart from me, you accursed ones, into the eternal fire prepared for the devil and his angels (Matthew 25:41). Thus, He states, the whole earth will undergo judgment, and many shall suffer, as if struck by the divine sword; these will be those condemned to eternal punishment, caught in the unquenchable fire, ensnared by the weight of their transgressions. Those who engage in false self-purification, rejecting redemption through Christ and dishonoring the grace of holy baptism—which justifies the unrighteous and liberates those stained by sin—will face even greater punishment than others who prefer to dwell in error and ignorance, worshiping non-existent deities and practicing impure rites. They may believe they cleanse themselves, deceiving both themselves and others, whether by water sprinkling or by carrying lit torches, under the delusion that this purifies their souls from the filth of vice. Their actions disregard decency and common sense, resembling irrational beasts. This is evident as they claim to purify themselves in groves, beneath trees like oaks and firs (Hos. 4:13), where they construct altars and temples for demons, consuming unclean meats in the courtyards of these idols. This act signifies an indulgence in sweetness. They also idolized detestable creatures and rodents, with some overly superstitious individuals even keeping mouse figurines in their shrines. However, He asserts that they will all perish collectively, alongside those in Israel who disobey: for I know their deeds and thoughts. By their thoughts, He refers to their desires, which led them to devise wicked schemes, resulting in the proliferation of abominations, even though they ought to serve the one true and natural God.

We should interpret this to mean the angelic powers, as the Lord shall come in the glory of the Father, accompanied by His angels, to judge the living and the dead: not in the notion that God is fire, but that He appears as fire to those undergoing chastisement. While Moses noted God as a consuming fire (Deut. 4:24), and the Apostle affirmed this (Heb. 12:29), the Saviour, revealing the essence of the Godhead, stated that God is Spirit (John 4:24). There exists a significant distinction between spirit and fire in a literal understanding. However, if He is fire or Spirit, why is He described as possessing eyes, ears, hands, feet, and a body, which spirit and fire do not have? God is termed a consuming fire because He eradicates every vice within us—hay, wood, straw, and thorns—symbolizing the anxieties of this age that the barren earth produces instead of good seed. Concerning this, it is said to the Hebrews that ‘But that which bears thorns and thistles is worthless, and is near to being cursed; and its end is to be burned’ (Hebrews 6:8). The Lord also spoke of this fire in the Gospel: “I came to bring fire to the earth” (Luke 12:49), and above it is noted: “wickedness shall be kindled like fire, and like dry thorns it shall be consumed by fire” (Isaiah 9:18). He will also eliminate all the tares which the adversary sowed while the householder slept (Matt. 13). The Epistle of James states: “even so the tongue is a little member, and boasteth great things” (James 3:5)! Proverbs also mentions: “as the bird by wandering, as the swallow by flying, so the curse causeless shall not come” (Proverbs 26:2). This can be understood metaphorically. I believe that this fire also descended upon the tongues of the apostles and all believers at Pentecost, when they spoke in various languages and dispelled the darkness of error, enlightening the hearts of those who accepted the Lord’s word (Acts 2). Thus, as a storm of chariots. We may draw parallels from the Psalms, where it states: “Our God shall come, and shall not keep silence: a fire shall devour before him, and it shall be very tempestuous round about him” (Psalm 49:3-4). In another instance: “the chariots of God are twenty thousand, even thousands of angels” (Psalm 67:18). Elisha was surrounded by these chariots and horses, which his servant could not see. Therefore he prayed, “Open, Lord, the eyes of this lad, that he may see.” And when his eyes were opened, he beheld chariots and horses all around (2 Kings 6). In this fiery chariot, Elijah was taken up to heaven, as Elisha exclaimed: “My father, my father, the chariot of Israel and the horsemen thereof!” (2 Kings 2:12). However, this is mentioned not because God possesses chariots, quadrupeds, or is driven by swift steeds; rather, it illustrates how He is depicted when assuming a position of judgment, especially when He comes for vengeance, striking His foes decisively, appearing as a victor in triumph. Regarding the Lord's wrath, we have previously noted that it should be understood as a form of abandonment, remorse, and other states inconsistent with God’s majesty. Thus, this fire and wrath, together with His chariots and flames of fire, will serve to judge all flesh in union with the Lord, such that the judgment is revealed not through might but through true justice. As stated in Micah and briefly echoed in the fiftieth Psalm: “For thou shalt be justified in thy words, and shalt be clear when thou judgest” (Psalms 50:6). The sword, through which all flesh shall be judged, refers to what has been discussed previously, and we shall now say this in part: “if ye will not be converted, He will whet His sword” (Psalms 7). This sword, punishing sinful flesh and all vice, was lamented by the Israelites when it was delivered into Pharaoh’s hands, leading them to say to Moses and Aaron, “The Lord look upon you, and judge; because ye have made our savor to be abhorred in the eyes of Pharaoh, and in the eyes of his servants, to put a sword in their hand to slay us” (Ex. 5:21). Concerning this sword, Amos states: “There shall die by the sword all the sinners of my people” (Am. 9:10), though there exist various forms of punishment. Therefore, that which harms, strikes, and torments is referred to in Scripture as the sword, by which those who do not fulfill God’s will and, having lost the light of truth, fall into the darkness of falsehood, are either wounded or condemned. Jeremiah proclaimed: “Can the Ethiopian change his skin” (Jeremiah 13:23), and Zephaniah stated: “And the Ethiopians shall be slain by my sword” (Zephaniah 2). The apostle elaborates on the meaning of this text in depth when he writes to the Romans: “But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God; who will render to every man according to his deeds: to them who by patient continuance in well doing seek for glory and honor and immortality, eternal life; but unto them that are contentious, and do not obey the truth, but obey unrighteousness, indignation and wrath” (Romans 2:5-9).

Of this fire from the Lord, it is said, "Fire shall burn before Him" (Ps. 96:3). The Lord is Himself a fire, as He stated, "I am a scorching and indestructible fire" (Ex. 3:2; 24:17; Deut. 4:24; Heb. 12:29). For the fire of the Lord is an eternal light, from which the lamps of His followers are kindled, as He previously instructed, "Let your loins be girded and your lamps burning" (Lk. 12:35). The lamp is essential, for the days of our lives are as night. Cleopas and his companion testify that this fire was ignited within them by the Lord: "Did not our heart burn... on the road when He opened the Scriptures to us?" (Lk. 24:32). This demonstrates the illuminating power of the fire in the depths of the heart. Therefore, it is perhaps for this reason that the Lord will appear in fire (Isa. 66:15) to eradicate all sins at the time of resurrection, fulfilling the hopes of all by His revelation and enlightening the path of virtues and mysteries.