Dharma · AI Companion

火災

tejasaṃvartanī

劫末以火焚毁世界的灾变。AI-generated

Type PhenomenaDifficulty IntroductoryTruth-level span outside the four-fold two-truths frameworkInitial AI estimate · evolves with use

A Contemporary ReadingAI-generated

What This Concept Is About

In the Buddhist cosmology, the world we inhabit is not eternal. It passes through an infinite cycle of four stages: formation (成, *vivarta*), abiding (住, *vivarta-siddha*), destruction (壞, *saṃvartanī*), and emptiness (空, *saṃvartasthāyin*). The cosmic conflagration (火災, *tejas-samvartanī*, "the conflagration that destroys the world") is precisely the first — and the most fundamental, most awe-inspiring — of the three root catastrophes (fire, water, wind) that occur when the world enters the "dissolution age" (壞劫, *saṃvartakalpa*), the phase of total annihilation.

Literally, the conflagration is an ultimate blaze that devours the entire receptacle world (器世間, *bhājanaloka*, the objective physical universe). But within the overall coordinate system of the Buddhist path of liberation, it is by no means a mere natural disaster or apocalyptic science fiction. It is **the most extreme and grandest physical manifestation of the doctrine of impermanence (無常, *anitya*)**.

To grasp the meaning of the "cosmic conflagration" with precision, one must strictly restore the multi-dimensional structure found in the classical scriptures (such as the *Dīrghāgama*, 長阿含經), rather than reducing it to an ordinary "great fire" or "geological catastrophe":

1. The "Collective Disaster-Avoidance Mechanism" Before the Catastrophe: Spiritual Elevation as the Refuge of Survival

The classical scriptures record that before the conflagration erupts, the world undergoes a great evacuation from the lower realms upward. This evacuation is accomplished not by building shelters or spaceships, but by the purification and cultivation of consciousness:

* When the dissolution age is imminent, human beings in the world spontaneously begin to cultivate the "ten wholesome deeds" (十善, *daśakuśala*). * Among them, some attain the "second dhyāna without applied and sustained thought" (無覺無觀第二禪; the first dhyāna still possesses the coarse and subtle applied and sustained thought [尋伺, *vitarka-vicāra*], whereas the second dhyāna is free from them — the mind is one-pointed [心一境性] and utterly serene), and ascend into the sky to proclaim this Dharma. * Hearing the Dharma, people cultivate accordingly and, at the end of life, are all reborn in the Heaven of Radiance and Sound (光音天, *ābhāsvara*), the highest heaven of the second dhyāna. * Subsequently, beings in the woeful destinies (惡道, *durgati*: hells, animals, hungry ghosts, asuras) and the heavens of the desire realm, as well as the inhabitants of the Brahmā palaces of the first dhyāna, owing to the wholesome karma of past lives or their present cultivation, are in turn reborn in the human world to cultivate this second dhyāna, and at death ascend to the Heaven of Radiance and Sound. * Boundary and outcome: Before the physical destruction arrives, the beings of the hells and even the Brahmā heavens have all dispersed — not a single one remains. This reveals a fundamental principle: **the form of life and the plane of existence are entirely determined by one's consciousness and karma; when the material environment is about to return to zero, only a mind endowed with concentration and wisdom (定慧, *samādhi-prajñā*) can transcend the strata that are collapsing.**

2. The Process and Boundary of Destruction: Seven Suns Appearing Together and the Interpenetration of the Four Great Elements

After the evacuation is complete, the destruction of the receptacle world formally begins:

* Precursor: The heavens send down no rain, and the hundred grains and grasses naturally wither and die. * Seven suns appearing together (七日並出): A great black windstorm arises and places the sun-palaces at mid-height of Mount Sumeru (須彌山, *Sumeru*), causing the phenomenal "seven suns appearing together" in the world. The extreme heat causes the four continents (四天下), Mount Sumeru, the palaces of the Four Heavenly Kings, the heavens of the desire realm, and even the Brahmā palaces of the first dhyāna (the Brahmakāyika heaven, 梵迦夷天, etc.) all to blaze and burn. * Boundary (the Heaven of Radiance and Sound / the Heaven of Recollection of Light, 光念天): The fierce tongues of fire, driven by the wind, shoot straight up toward the Heaven of Radiance and Sound. Newly born devas, seeing the fire surge upward, are terrified; but the gods born there earlier console them: 「彼火曾來,齊此而止」 (*"This fire has come before; it stops right here."*). The scripture adds that because the heavenly beings "recollect the former fire" (念前火光), this heaven was also called in ancient translations the Heaven of Recollection of Light (光念天). The upper limit of the conflagration's destruction stops precisely below the Heaven of Radiance and Sound; all physical matter of the first dhyāna and below is utterly incinerated. * Total consumption: In the end, the earth and Mount Sumeru are left with not even a particle of ash; even the water beneath the earth and the wind beneath the water are completely burned away, leaving not a trace. * The essence of the four elements' interpenetration (四大相即): Through a dialogue among the deities, the scripture emphasizes: 「火中有地、水、風,但火大多故,火大得名。」 (*"Within fire there is earth, water, and wind; but because the fire element is predominant, it takes its name from the fire element."*). This shows that the collapse of the cosmos is a fundamental deconstruction of the internal balance of the material foundations (earth, water, fire, wind).

3. Re-formation After the Catastrophe (the Return of the Fire Age): From Water-Foam to World-Reassembly

After the conflagration has burned everything away, the world enters the "empty age" (空劫, *saṃvartasthāyikalpa*), and then welcomes the reassembly of the "formation age" (成劫, *vivartakalpa*):

* In the void, a torrential rain descends, great as cartwheels, and four great winds — "abiding wind, sustaining wind, immovable wind, and firm wind" — together hold up the accumulated water. * Then a wind named "saṃgha" (僧伽) blows across the water's surface, stirring up layers of foam, and the water-foam naturally hardens in the void. * In sequence, the palaces of the Brahmakāyika heaven and other heavens are re-created; then the foam further congeals and manifests the vajra ring-mountain (金剛輪山), the palaces of sun and moon, the four continents, and the four great seas — and a new world cycle is again brought into being.

This complete picture of "evacuation — destruction — restoration" carries an extremely critical doctrinal function in the path of liberation: it tells the practitioner that even the objective world — solid as Mount Sumeru, splendid as the Brahmā palaces — will in the end be reduced to nothing. **「一切行無常,變易朽壞」 (*"All conditioned things are impermanent, subject to change and decay"*) — only seeking the path of transcendence and liberation from the cycle of birth and death (度世解脫) is the eternal refuge (依怙).**


A Walkthrough in Daily Life

The "Mount Sumeru," "seven suns appearing together," and "Heaven of Radiance and Sound" of the ancient scriptures may seem far removed from contemporary lived experience. Yet if we map the "receptacle world" onto the external life system we spend a lifetime constructing (career platform, wealth accumulation, social circles, health status), and map the "cosmic conflagration" onto the crisis of systemic loss of control and total collapse, this concept has an extremely precise projection in contemporary life.

Let us walk through the full crisis process of a contemporary high-pressure elite (for example, an internet entrepreneur or executive) and see how the logic of the conflagration unfolds in everyday life:

Stage One: The Drought Precursor (System Stiffening and Resource Exhaustion)

* Classical definition: The heavens send down no rain; the hundred grains and grasses naturally wither and die. * Contemporary mapping: Your industry enters a downturn, business growth stagnates, your body begins to send frequent sub-health alarms, and team morale unravels. You feel life has dried up and lost its nourishment; patterns that once worked gradually fail. * Common mapping error: People often assume crisis strikes suddenly (imagining "fire" is born from nothing in an instant), overlooking that "drought — the loss of the system's inner vitality — is the necessary precondition for the conflagration."

Stage Two: Seven Suns Appearing Together and the Fierce Fire Consuming All (Cascading Collapse and Total Return to Zero)

* Classical definition: Seven suns appear together; the high temperature burns the four continents, Mount Sumeru, and even the Brahmā palaces to nothing, leaving not even ash. * Contemporary mapping: The crisis erupts in full — the company's capital chain breaks, years of savings vanish, the social titles you once prided yourself on (Mount Sumeru) cease to exist; a partner relationship breaks down; a serious illness is detected. All the external pillars (earth, water, fire, wind) on which you built your self-identity are burned clean by the "fierce fire" within a few short months, leaving not even a single ember (no room for maneuver). * The classical anti-counterfeit line: The conflagration is a total destruction that leaves "not even ash." When contemporary people suffer a blow, they often mistake it for "just a setback" and try to patch things up with old logic. But a true "conflagration-style crisis" wipes out the very underlying supports you pride yourself on, forcing you to face the most pristine "impermanence."

Stage Three: The Evacuation Mechanism and the Heaven of Radiance and Sound (A Leap in the Level of Mind)

* Classical definition: People cultivate the ten wholesome deeds and attain the "second dhyāna without applied and sustained thought," ascending to the Heaven of Radiance and Sound to escape the catastrophe; beings from the hells up to the Brahmā heavens are likewise reborn in the human world to cultivate this concentration and are thereby delivered. * Contemporary mapping: When the external world collapses completely, who remains free of destructive trauma? Not those who desperately cling to their assets (for the assets have already been burned away), but those who long ago established within their minds a "second-dhyāna-style" concentration and awareness. * "Without applied and sustained thought" means being free from the coarse and subtle rumination over external disturbances (no longer endlessly complaining, worrying, or calculating). * Those who, before the crisis came, knew how to practice inner contemplation, cultivated the ten wholesome deeds, and did not bind their self-worth to external material — their consciousness has long been elevated to the level of the Heaven of Radiance and Sound. The external enterprise may burn away, but their inner peace is stable; they do not suffer mental collapse along with society's ruin. * Common mapping error: To think that "evacuation" means "retreating to a hermitage" or "moving assets offshore." The scripture states it very clearly: the essence of evacuation is the elevation of the level of consciousness (cultivating dhyāna and being born in heaven), not escape in physical space.

Stage Four: The Saṃgha Wind and Reconstruction (Post-Crisis Creative Rebirth)

* Classical definition: After the catastrophe, great rain falls; the four great winds hold the water; the "saṃgha" wind stirs the water-foam into solidity, re-manifesting the world. * Contemporary mapping: After experiencing complete bankruptcy and return to zero, you no longer cling to the ruined remnants. In the stillness (the empty age), a pure vow and reason (the saṃgha wind) are freshly born from the depths of your mind, and you begin to re-plan your life on the basis of healthier values, building a new life order (the world re-forms).


Why Contemporary People Need It

Contemporary society is an age that intensely emphasizes "construction" and "possession." Algorithms encourage us to accumulate followers, economics encourages us to accumulate assets, and success literature encourages us to build empires. Yet this fixation on "eternal growth" keeps contemporary people at high risk of brittleness and rupture.

We need the concept of the "cosmic conflagration" for at least the following three layers of wisdom:

1. Breaking Through the "Ultimate Illusion": Accepting the Inevitable Deconstruction of Material Systems

The greatest anxiety of contemporary people stems from a hidden assumption: what I build should be eternal. We want our companies to operate forever, our property to appreciate forever, our bodies to stay young forever. The cosmology of the conflagration offers a shockingly effective coolant: even Mount Sumeru and the Brahmā palaces, gathering countless devas and wielding boundless power, will be reduced to "not even ash" when the dissolution age arrives. The physical laws of the universe themselves contain the program of the "dissolution age." Recognizing this does not lead one to pessimism, but confers a "clear-eyed composure" — when crisis and decay arrive, one no longer experiences the disillusionment of panic, because impermanence and destruction are from the outset the underlying code of this world.

2. Locating the "True Safe Zone": From External Dependence to Inner Cultivation

The evacuation mechanism of the conflagration reveals Buddhism's extremely distinctive logic of salvation: when facing destruction, the highest safe zone lies not in the physical world but in the depth of consciousness. We can compare this with contemporary technology and neuroscience: * Contemporary empirical comparison: Contemporary technology attempts to address humanity's ultimate crisis through gene editing, consciousness uploading, or Mars colonization; neuroscience also studies how to relieve fear by stimulating neurotransmitters. * The limitation: These scientific means remain entirely within the "receptacle world (the physical/physiological level)." From the standpoint of Buddhist doctrine, as long as your existence depends on matter (earth, water, fire, wind), you remain forever within the coverage of the conflagration, flood, and wind (because the fire can reach the Brahmā heavens of the first dhyāna). Neuroscience interventions can alter temporary emotional states, but they cannot resolve life's dependence on and attachment to material conditions. * The warning of the conflagration concept: Only through cultivation (such as practicing the ten wholesome deeds and attaining meditative concentration), elevating the quality of consciousness, can one cross over the crisis. True insurance is not the deposit in the bank, but whether, when facing systemic collapse, your mind possesses the concentration of "without applied and sustained thought."

3. Understanding the "Interpenetration of the Four Elements": A Systemic View of Crisis

The scripture says, 「火中有地、水、風,但火大多故,火大得名」 (*"Within fire there is earth, water, and wind; but because the fire element is predominant, it takes its name from the fire element"*). This teaches us to view crises in life systemically: when a blaze of anger, a conflict, or a financial crisis (the fire element in excess) erupts, it does not exist in isolation — behind it are interwoven real conditions (earth), emotional flow (water), and ideological propulsion (wind). Understanding the principle of interpenetration, we can, when a crisis erupts, not merely beat at the surface flames, but harmonize the balance of the entire system.


Common Misreadings and Clarifications

To preserve the purity and rigor of Buddhist doctrine, we need to clarify several common contemporary misreadings of the "cosmic conflagration":

Misreading One: Equating the "Cosmic Conflagration" with the Western Religious "Last Judgment" or "Divine Punishment"

* Clarification: Western eschatology often carries a hue of divine judgment (a god sends down fire to punish the world for human sin). But the Buddhist conflagration is an objective manifestation of natural law and the collective karma of sentient beings (共業). The arrival of the dissolution age is a necessary link in the cycle of "formation, abiding, destruction, emptiness"; the conflagration is not the wrath of some supreme deity, but a physical phenomenon of the world's cyclical energy and the evolution of the four elements (the fire element in excess).

Misreading Two: Treating the "Heaven of Radiance and Sound" as a Physical Escape Planet

* Clarification: Some people, seeing the scriptures say beings ascend to the Heaven of Radiance and Sound, analogize it to "alien migration in science fiction." This is a typical case of sloppy conceptual translation. In Buddhism, the Heaven of Radiance and Sound is the highest heaven of the second dhyāna in the form realm (色界, *rūpadhātu*); to reach it, one must rely on the karmic force of a consciousness that has attained the "second dhyāna without applied and sustained thought", not on a physical vehicle. If inner greed, hatred, and delusion (貪瞋癡, *rāga-dveṣa-moha*) are not removed and meditative concentration is not attained, even flying a spaceship to the end of the universe still leaves one within the conflagration's range of destruction.

Misreading Three: Thinking the Conflagration Is Merely Negative Apocalyptic Catharsis, Overlooking Its Dialectical "Return (Reconstruction)"

* Clarification: Seeing only the "fierce fire burning all away" easily leads to falling into the view of annihilation (斷滅見, *ucchedadṛṣṭi*, nihilism). The classical scriptures, after describing the conflagration, immediately proceed to elaborate the world-reconstruction process of "the saṃgha wind stirring the water-foam". Destruction (the dissolution age, the empty age) is the prelude to re-formation (the formation age). In the path of liberation, total destruction means a thorough settling of accounts with old attachments; only after experiencing the demolition of "not even ash" can true liberation and wisdom (and even the re-formation of a new world) be established on a foundation free of clinging.

Canonical EntryAI-generated

一、定义与核心要义

根据《長阿含經》,火灾(tejas-samvartanī)是坏劫时毁灭世界的三大灾(火、水、风)之一。当火灾发起时,世间从地狱、四天下、须弥山王直至梵天宫殿皆被猛火悉皆洞然烧尽,其最高界际以光音天为限。火灾的发生不仅是器世间的彻底毁灭,也是对一切行无常、变易朽坏的深刻警示。

二、主要阐述

1. 避灾机制与众生转生:在火灾将起之前,世间众生会经历一次大避灾。世间人开始修习十善,当有人证得「无觉、无观第二禅」后,便在空中宣唱。世人闻此法门后依法修持,命终皆往生于光音天。随后,地狱、畜生、饿鬼、阿须伦乃至梵天界的众生,也依次转生到人间修习此禅,并在命终后生于光音天。最终,地狱道乃至梵天界的众生悉皆散尽,无一遗留。 2. 火灾的爆发与毁灭过程:火灾的爆发经历干旱、七日并出与猛火燃尽三个阶段。首先,天不降雨,百谷草木自然枯死。接着,大黑风暴起,将日宫殿置于须弥山半,导致世间出现「七日出」的异象。七日并出产生极度高温,使四天下、八万天下、须弥山王、四天王宫乃至梵天宫殿皆悉洞然燃烧。火焰在风力吹送下直达光音天,初生的天子见此猛火产生怖畏,而先生的诸天则安慰他们「彼火曾来,齐此而止」,由于天众「念前火光」,故该天又被称为「光念天」。最终,大地、须弥山尽无灰物,连地下的水、水下的风也全部被烧尽,不留痕迹。 3. 灾后世界的复成(火劫还复):器世间毁灭后,世界进入重建阶段。虚空中降下如车轮般的大雨,由「住风、持风、不动、坚固」四大风力共同持住此水。随后,一种名为「僧伽」的风吹动积水,使其表面生起泡沫,并在空中自然坚固,依次重新塑造出梵迦夷天、他化自在天等诸天宫殿。接着,水沫进一步化现出金刚轮山、日月宫殿、四天下以及四大海,世界得以重新复成。

三、不同部类与译本的表述差异

在《長阿含經》的表述中,存在一些独特的术语和译名。例如,对于避灾所依凭的禅定,经中特称为「無覺、無觀第二禪」;对于在灾后重构世界、吹动水沫的风,经中译为「僧伽」风;而对于火灾所及的最高界际「光音天」,经中因其天众「念前火光」的典故,又将其称为「光念天」。这些特定的用词和解释,反映了该经在汉译过程中的独特译法。

四、与相关概念的关系

1. 与水灾、风灾的关系:火灾与水灾、风灾并称为毁灭世界的三灾,但其毁灭的范围和界际各不相同。火灾的界际至光音天而止。 2. 与四大(地水火风)的关系:经中通过神祇对话阐明了四大相即的道理,指出「火中有地、水、风,但火大多故,火大得名」。这说明火灾虽然表现为猛火毁灭一切,但其本质中仍包含其他三大的成分,只是火大偏盛。 3. 与无常的关系:火灾的毁灭过程是佛教无常观的具象化体现。经文在描述世界化为灰烬时,反复强调「一切行無常,變易朽壞……當求度世解脫之道」,以此警示众生不可执着于器世间,而应追求解脱。

五、代表性原文引用

1. 关于火灾界际与避灾:「世有三災。何等為三?一者火災,二者水災,三者風災……火災起時,至光音天,光音天為界」。 2. 关于七日并出与毁灭:「七日出已,此四天下及八萬天下、須彌山王、四天王宮、忉利天宮、焰摩天宮、兜率天宮、化自在天宮、他化自在天宮、梵迦夷天宮悉皆洞然……」。 3. 关于四大相即:「火中有地、水、風,但火大多故,火大得名」。 4. 关于灾后复成:「時,有大風起,名曰僧伽,吹此水沫,在虛空中,自然堅固……」。

By SutraAI-generated

長阿含經T0001 · 阿含部

《長阿含經》論火災,置於「四事長久」之宇宙時間框架中:世間災漸起而壞、壞已空曠、天地初起向成、成已久住,四者皆「無量無限,不可以日月歲數而稱計」。經中明立「三災」之名——火災、水災、風災,並各定其「上際」:火災至光音天為際,水災至遍淨天為際,風災至果實天為際。此「三災上際」之術語形式,為本經論述劫末災變之獨特結構。

火災之起,經文先敘人道轉勝之因緣:世間人皆行正法、修十善行,有人得第二禪,踊身昇虛空,唱言「無覺、無觀第二禪樂」,眾人聞而修之,命終生光音天;地獄、畜生、餓鬼、阿須倫乃至梵天眾生亦展轉來生人間、同修第二禪而生光音天,由此諸道皆盡。此即火災將起之前相——下界已空,唯餘器世間待毀。

正毀之狀,經以「七日出」為核心意象:大黑風暴起,吹海底沙八萬四千由旬置於須彌山半,安日道中,「緣此世間有七日出」。七日既出,四天下、八萬天下諸山、須彌山王「皆悉洞然」,經以「猶如陶家然竈焰起」為喻。火勢自下而上:四天王宮、忉利天宮、炎摩天宮、兜率天、化自在天、他化自在天、梵天宮「亦皆洞然」;風吹火焰至光音天而止。光音天初生天子見火怖畏,先生諸天告以「彼火曾來,齊此而止」,經云「以念前火光,故名光念天」。須彌山王漸次頹落,自百由旬至七百由旬;大地及須彌山「盡無灰燼」,地下水盡,水下風盡。經於每一層毀壞後反覆申說「一切行無常,變易朽壞,不可恃怙,凡諸有為甚可厭患,當求度世解脫之道」,以此為火災敘事之歸趣。

火災之極致,經謂「天不復雨,百穀草木自然枯死」,乃至地下水盡、水下風盡,並言「誰當信者?獨有見者,自當知耶」,強調此境非凡夫所能信受,唯親見者方知。

火災既盡,經繼以「火劫還復」:大黑雲至光音天周遍降雨,渧如車輪,無數百千歲;有四大風——住風、持風、不動、堅固——持水令住;水漸減後,僧伽風吹水鼓蕩濤波,起沫積聚,風吹離水,自然堅固變成天宮,七寶校飾,依次成梵迦夷天宮、他化自在天宮、化自在天宮、兜率天宮、炎摩天宮。復有亂風吹大水沫成金剛輪山、月宮殿、七日宮殿、四天下及八萬天下、大金剛輪山,再降雨成四大海水。經末以「是為火災」結之。

術語方面,本經始終稱「火災」,不稱「火劫」為災名(唯於還復段用「火劫還復」一語);稱世界毀壞之過程為「壞此世」;稱天界層級用「光音天」「遍淨天」「果實天」;稱風名用「僧伽」;稱日之出現用「七日出」。

阿毘達磨俱舍論T1558 · 毘曇部

《阿毘達磨俱舍論》論「火災」,置於壞劫之框架下,屬器世間壞滅三災(火、水、風)之首。論中先總說壞劫歷程:世間經二十中劫住已,壞劫便至。有情世間先壞——地獄有情不復新生,漸次上遷;人趣眾生無師法然得初靜慮,命終並生梵世;欲界有情漸盡。而後唯器世間空曠而住,火災乃起:「諸海乾竭眾山洞然,洲渚三輪並從焚燎,風吹猛焰燒上天宮,乃至梵宮無遺灰燼」。其具體相狀為感此三千世界業盡後,漸有七日輪現,海水乾竭,山岳洞然,火焰上燒天宮。論中特別辨析火災作用範圍:「自地火焰燒自地宮,非他地災能壞他地」,每一地之火唯燒自地宮殿;所謂「下火風飄焚燒上地」,乃欲界火猛焰上昇為緣引生色界火焰,非欲界火徑燒色界。論中明確界定火災頂限:「第二靜慮為火災頂,此下為火所焚燒故」,即火災所毀下至地獄、上極初靜慮梵世,第二靜慮以上非火所及。三災各有其頂:火災頂在第二靜慮,水災頂在第三靜慮,風災頂在第四靜慮。論中更以內外災相應之理釋其所以:「初靜慮尋伺為內災,能燒惱心等,外火災故」——尋伺燒惱於心猶火燒物,故與外火災相應;第二靜慮喜受為內災,與輕安俱潤身如水,對應外水災;第三靜慮動息為內災,息即是風,對應外風災。「若入此靜慮有如是內災,生此靜慮時遭是外災壞」。第四靜慮無外災,離內災故,佛說彼名「不動」,內外三災所不及。論又設問「何緣不立地亦為災」,答以器世間即是地,火等可與地相違,不可說地還違地,故不立地災。此外論中於破極微實有時亦借火為喻:「於一火光明界中,遠近不同燒照有異」,以火光遠近燒照差別破觸色實有之執;又舉「燒毛㲲紅花等時彼覺則無」,明毛等覺但緣色等差別而起。總之,本論以「火災」為壞劫中器世間焚毀之正相,以七日並出為其起因,以第二靜慮為其頂限,以初靜慮尋伺為其內因,構成一套內外相應、層級分明之災變論述。

瑜伽師地論T1579 · 瑜伽部

《瑜伽師地論》以「火災」為器世間壞劫之首,置於完整的劫數架構中論述。論先明時間尺度:壽量一減一增合成一中劫,二十減、二十增合四十增減方出住劫;住劫中有儉、病、刀三種小災,屬有情共業所感之衰損,與火災之壞器世間層次不同。

火災之起,論以「六日輪」為核心機制。住劫既盡,五趣有情次第遷沒——那落迦先沒不生,傍生、餓鬼、人、天相繼空盡——天雨遂絕,藥草叢林枯槁,日輪熱勢增大;復由「有情能感壞劫業增上力」及「六種所燒事」,六日輪漸次而現,每一新日輪熱勢踰前四倍,七輪既成,熱遂增七。六所燒事各有對應之日輪:小大溝坑為第二日輪枯竭,小河大河為第三,無熱大池為第四,大海為第五及第六一分,蘇迷盧山及大地以體堅實故為第六一分及第七日輪所燒然。火焰為風所鼓,展轉熾盛,極至梵世。論又將所壞略攝三事:水所生事(藥草等)由初所槁,水事由五所涸,恒相續住體堅實事由二所燒。燒盡之後,「乃至灰墨及與餘影皆不可得」,是名器世間已壞,滿足二十中劫。

火災非孤立事件,論明其在大三災中的固定序列:過七火災已,第二靜慮中俱生水界起,壞器世間如水消鹽,是為水災;七水災過已,復七火災,無間於第三靜慮中俱生風界起,壞器世間如風乾支節、復能消盡,是為風災。火災所壞極至梵世(初靜慮),水災壞至第二靜慮,風災壞至第三靜慮,三災所及之禪定層次遞進。

火災之後,論接說世間還成:過二十中劫,有情業增上力故世間復成,第三、第二、初靜慮器世間於虛空中次第而成,欲界四天宮殿如化而出;大風輪從下而起持水令堅,金藏雲興降雨,風鼓水堅成金性地輪。此成壞往復構成論中世界觀之完整循環。

末後,論以「二世間」框架總攝:一有情世間,二器世間;器世間為火災等之所壞滅,有情世間則剎那剎那各各內身任運壞滅。此處將火災歸於器世間之共相壞滅,與有情個體之剎那無常對舉,顯示火災屬外器之劫壞而非內身之生滅。

術語方面,本論一律用「火災」「水災」「風災」之名,稱物質世界為「器世間」,稱劫之階段為「住劫」「壞劫」,稱時間單位為「中劫」,稱日輪出現為「日輪」,稱所燒對象為「所燒事」,稱業力為「能感壞劫業增上力」,皆為本論特有之表述形式。

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