Dharma · AI Companion

自相空

svalakṣaṇaśūnyatā

诸法各自特相本无自性的空。AI-generated

Type ViewDifficulty AdvancedTruth-level span II · emptinessInitial AI estimate · evolves with use

A Contemporary ReadingAI-generated

What Is *Svalakṣaṇa-śūnyatā* Saying?

In Mahāyāna Buddhism, particularly within the foundational frameworks of the *Māhaprajñāpāramitā Sūtra* (*Mohe Bore Boluomi Jing* 《摩訶般若波羅蜜經》) and the *Mahāsaṃnipāta Sūtra* (*Dafangdeng Daji Jing* 《大方等大集經》), "Emptiness of Specific Characteristics" (*svalakṣaṇa-śūnyatā* 自相空) is one of the eighteen or twenty core modes of Emptiness (*śūnyatā* 空).

To understand *svalakṣaṇa-śūnyatā*, we must first dismantle what "specific characteristic" (*svalakṣaṇa* 自相) means in classical Buddhist ontology:

- **What is a *Svalakṣaṇa* (Specific Characteristic)?** It refers to the unique, defining property or functional marker that distinguishes one phenomenon (*dharma* 法) from another. Buddhist texts traditionally classify all conditioned (*saṃskṛta* 有為) and unconditioned (*asaṃskṛta* 無為) phenomena through the framework of the Five Aggregates (*pañca-skandha* 五陰/五蘊): 1. Form (*Rūpa* 色): Defined by its characteristic of *ruppana* or *bādhanā*—"Ruining/Marrability" (*色壞相*) in Kumārajīva’s translation, or "Afflictive Ruin/Obstruction" (*惱壞是色相*) in Dharmakṣema’s translation [15766]. It is that which can be physically broken, altered, or occupied in space. 2. Sensation/Feeling (*Vedanā* 受): Defined as "Experiencing/Receiving" (*受受相*) or the "Ability to Experience" (*能受是受相*) [13034, 15766]. It is the unique functional mark of undergoing pleasant, painful, or neutral contact. 3. Perception (*Saṃjñā* 想): Defined as "Grasping Signs/Identification" (*想取相* / *取相是想相*) [13034, 15766]. It is the mental cognitive operation of isolating marks (e.g., "blue," "large," "enemy") to categorize experience. 4. Volitional Formations (*Saṃskāra* 行): Defined as "Volitional Action/Creation" (*行作相* / *造作是行相*) [13034, 15766]. It is the mental impulse, intention, and karma-shaping drive that directs action, not merely the outer physical movement itself. 5. Consciousness (*Vijñāna* 識): Defined as "Cognitive Awareness/Discrimination" (*識識相* / *了知是識相*) [13034, 15766]. It is the raw, luminous act of knowing or apprehending an object.

These defining characteristics—the physical resistance of matter, the felt charge of sensation, the isolating function of concept, the driving impulse of volition, and the knowing act of awareness—are what we rely on to navigate reality. They are the "fingerprints" of existence.

- **What does *Svalakṣaṇa-śūnyatā* (Emptiness of Specific Characteristics) claim? It asserts that these defining characteristics themselves are fundamentally empty of intrinsic, independent self-existence (*svabhāvataḥ śūnya*)**.

Crucially, this emptiness is defined by classical texts through specific negative and positive qualifiers: * "Neither impermanent nor destroyed" (*非常非滅*) [13034]: Emptiness is not a temporal process where a solid characteristic comes into being and then dissolves into nothingness; it never possessed a substantial, independent entity to begin with. * "Non-aggregated" (*非積聚*), "Indestructible" (*不可壞*), and "Unapprehendable" (*不可取*) [15766]: You cannot stack characteristics together to build an absolute essence, nor can you destroy an underlying substance that isn’t there, nor can you ultimately grab hold of a isolated characteristic in isolation. * "Naturally So" (*性自爾* / *諸法性爾*) [13034, 15766]: This emptiness is not produced by a meditator's mental analysis, nor is it created by the Buddha, Arhats, or Pratyekabuddhas [15765, 15766]. It is the intrinsic nature (*dharmatā* 法性) of reality itself.

In the path to liberation (*vimukti* 解脫), *svalakṣaṇa-śūnyatā* occupies a pivotal, uncompromising position. Unenlightened beings (*pṛthagjana* 凡夫) suffer because they take these unique marks (*svalakṣaṇa*) as real, fixed, self-sustaining entities, building delusions (*viparyāsa* 顛倒) and generating karmic actions (*karma-nidāna* 作業因緣) upon them.

The Bodhisattva, realizing *svalakṣaṇa-śūnyatā*, sees that all marks—from physical form to the highest spiritual realizations like the Four Noble Truths (*catvāry āryasatyāni* 四聖諦) and Unexcelled Complete Enlightenment (*Anuttara-samyak-saṃbodhi* 阿耨多羅三藐三菩提)—are empty like space (*ākāśa-sama* 性如虛空) [12648, 14621, 14628]. Thus, the sūtra famously declares: "The emptiness of specific characteristics of all phenomena IS Unexcelled Complete Enlightenment" (*諸法自相空即是阿耨多羅三藐三菩提*) [14628].


A Walkthrough in Contemporary Life

To grasp *svalakṣaṇa-śūnyatā*, we must run a practical audit on a ordinary modern moment—such as receiving a blunt, critical ping from your manager on a work chat app during a late-night crunch.

Let us track how our mind experiences this moment through the Five Aggregates (*pañca-skandha*), mapping each precise classical definition and identifying where modern misattributions occur:

1. Form (*Rūpa* / 色)

* Classical Definition: *Ruining / Afflictive Obstruction* (*色壞相* / *惱壞是色相*) [13034, 15766]. Matter that occupies space, presents resistance, and is subject to physical breakdown. * Everyday Experience: The glowing screen of your laptop, the physical vibration of the phone, your tensed shoulder muscles, the constriction in your chest. * Common Misattribution: Reducing "Form" merely to one's own physical body. In Buddhism, *rūpa* includes all primary elements and matter, both internal (your heart pounding) and external (the pixels on the screen, the room's light). * The Emptiness Walkthrough: The light on the screen and the sensation in your chest are transient physical configurations dependent on electricity, biology, and sensory optics. They carry no inherently toxic or hostile quality in their physical substance alone. The material screen is empty of an intrinsic "stressful" characteristic.

2. Sensation (*Vedanā* / 受)

* Classical Definition: *Experiencing / Ability to Experience* (*受受相* / *能受是受相*) [13034, 15766]. The immediate, raw hedonic tone—pleasant, unpleasant, or neutral. * Everyday Experience: The instant, visceral drop in your stomach—a sharp, unpleasant hedonic charge (*duḥkha-vedanā* 苦受) upon reading the message. * Common Misattribution: Confusing *vedanā* with complex emotional narratives ("I am a failure," "My boss hates me"). *Vedanā* is strictly the immediate hedonic tone of contact. * The Emptiness Walkthrough: That sinking feeling feels like a solid, objective "badness" embedded in reality. But *svalakṣaṇa-śūnyatā* reveals that the characteristic of "being unpleasant" (*能受相*) has no independent core. It arises instantly due to sensory contact and conditioned reflex, lacks any solid structure ("non-aggregated" 非積聚), and cannot be pinned down as an unalterable object.

3. Perception (*Saṃjñā* / 想)

* Classical Definition: *Grasping Signs / Identification* (*想取相* / *取相是想相*) [13034, 15766]. The cognitive isolation of features to recognize and categorize. * Everyday Experience: Your mind instantly isolated the specific phrasing of the ping, tags it as "Aggressive," identifies the sender as "Threat," and categorizes the situation as "Imminent Job Loss." * Common Misattribution: Misinterpreting *saṃjñā* as general "thoughts" or intellectual opinion. *Saṃjñā* is specifically the perceptual act of isolating a sign/mark (*nimitta-grahaṇa* 取相) out of a complex field of raw data. * The Emptiness Walkthrough: You treat the label "Threatening Message" as an intrinsic property residing *inside* the text. In reality, the text is a sequence of Unicode characters. The "threat-ness" is a mark constructed entirely by your mind’s projective identification (*取相*). The characteristic of perception is empty because the sign it grasps is devoid of fixed self-nature.

4. Volitional Formations (*Saṃskāra* / 行)

* Classical Definition: *Volitional Action / Creation* (*行作相* / *造作是行相*) [13034, 15766]. The internal mental intention, impulse, and drive that constructs karma. * Everyday Experience: The immediate surge of impulse: the urge to type a defensive reply, to close the laptop in anger, or to update your resume in panic. * Common Misattribution: Equating *saṃskāra* with external bodily action. *Saṃskāra* is the internal psychological volition and intentional impulse (*cetanā* 思), not the physical keystrokes themselves. * The Emptiness Walkthrough: The intense urge to fight or flee feels like an imperative, unshakeable reality. Yet, this volition is an impermanent, composite mental mental impulse arising from prior habits. It is "unapprehendable" (*不可取*) as a permanent controller. The characteristic of volitional creation (*造作相*) is inherently empty.

5. Consciousness (*Vijñāna* / 識)

* Classical Definition: *Cognitive Awareness / Discrimination* (*識識相* / *了知是識相*) [13034, 15766]. The moment-to-moment raw knowing of an object. * Everyday Experience: The luminous, moment-by-moment awareness that apprehends the sound of the notification, the sight of the text, and the internal feeling of anxiety. * Common Misattribution: Treating consciousness as an underlying, eternal "Soul" or true "Observer-Self" behind experience. * The Emptiness Walkthrough: Even this act of raw awareness (*了知相*) does not exist independently as a permanent container. It arises in strict dependence on sense organs and sense objects. Consciousness itself is devoid of an unchangeable essence; its characteristic of "knowing" is empty of self-nature.


Why Contemporary People Need It

In modern life, we are surrounded by hyper-detailed systems of classification. Algorithms analyze our behavioral data, metrics measure our productivity, and social media feed our brains a constant stream of crisp, bite-sized "marks" (*lakṣaṇa*) designed to evoke immediate emotional reactions.

We live under the illusion that these characteristics are ultimate realities: * Algorithmic & Mental Reification: When an algorithm tags a user profile or when we tag ourselves ("anxious personality," "unproductive day"), we treat these constructed marks (*svalakṣaṇa*) as solid, immutable traits. * Neuroscientific & AI Analogies (and Their Limits): Modern cognitive science and AI predictive processing suggest that what we perceive is not "raw reality," but a predictive mental model constructed by the brain's sensory inputs—a process reminiscent of how *saṃjñā* isolates signs. However, cognitive science and AI models have clear limits here: science treats these mechanisms as physical interactions within a real, objective material brain or electronic architecture. *Svalakṣaṇa-śūnyatā* goes vastly deeper—it points out that the material brain, the algorithms, and the physical particles themselves are also empty of intrinsic self-existence (*svalakṣaṇa-śūnya*).

Without understanding *svalakṣaṇa-śūnyatā*, modern people fall into two psychological traps: 1. **Fixation and Anxiety (*Abhiniveśa* 執著): Believing that bad circumstances, personal shortcomings, or stressful feelings possess an absolute, fixed "badness," leading to chronic stress and existential trappedness. 2. Nihilism (*Ucchedavāda* 斷見):** Attempting to escape stress by destroying or ignoring reality, collapsing into indifference.

*Svalakṣaṇa-śūnyatā* offers a profound middle way: Phenomena function precisely because they are empty. Because a bad mood, a difficult project, or a social identity has no fixed, independent essence (*svalakṣaṇa*), it is dynamic, open, and transformable.

This leads to the radical Bodhisattva practice described in the *Prajñāpāramitā*: "Practice by non-practicing" (*不行是名行般若波羅蜜*) [15636]. When engaging in work, relationship, or meditation, the Bodhisattva does not grasp at the marks of action (*不取相*), nor does he physically destroy or deny the appearance of the marks (*不壞相*) [14698]. One acts fully, flexibly, and compassionately, unburdened by the illusion of fixed essences.


Common Misreadings and Clarifications

Misreading 1: "Emptiness of specific characteristics means things don't exist at all."

* Clarification: *Svalakṣaṇa-śūnyatā* does not deny conventional existence (*samvṛti-satya* 俗諦) or functional utility. Fire still burns, and water still hydrates. What it denies is that fire possesses an independent, unconditioned, inherent core called "burning-ness" that exists out of context. The sūtra emphasizes that emptiness is "neither permanent nor destroyed" (*非常非滅*) [13034]. It does not wipe out appearances; it reveals their ungraspable, interdependent nature.

Misreading 2: "Characteristics are real, but when I meditate, my wisdom makes them empty."

* Clarification: Emptiness is not a mental state produced by meditation. As both the *Māhaprajñāpāramitā Sūtra* and *Mahāsaṃnipāta Sūtra* stress, emptiness is "naturally so" (*性自爾* / *諸法性爾*) [13034, 15766] and "neither made by wisdom nor made by views" (*非智作非見作*) [15766]. Meditation does not *make* things empty; it simply ceases the cognitive illusion of projecting solidity onto what was always naturally empty.

Misreading 3: "Space (voidness) is the source or cause that produces all phenomena."

* Clarification: Classical sūtras frequently use the Simile of Space (*虛空喻*) [12648, 14621], stating that all phenomena are equal to space (*與虛空等*). However, space is used purely as a metaphor for unobstructedness, lack of inherent boundary, and absence of fixed characteristics (*無有相貌*) [12648]. Space is not a metaphysical "cosmic soup" or creator force from which physical things emerge.

Misreading 4: "Spiritual practice means transcending everyday marks to reach a separate, perfect 'Absolute Mark'."

* Clarification: The *Māhaprajñāpāramitā Sūtra* explicitly warns against turning enlightenment into a superior, reified "thing." The text declares: "The emptiness of specific characteristics of all phenomena IS Unexcelled Complete Enlightenment" (*諸法自相空即是阿耨多羅三藐三菩提*) [14628]. There is no secret, ultimate "characteristic" hiding behind empirical reality. Realizing that everyday, conditioned marks are themselves ungraspable and empty *is* the realization of Buddhahood.

Canonical EntryAI-generated

一、定义与核心要义:「自相空」(svalakṣaṇa-śūnyatā)是佛教大乘经典中阐释的重要空性原理,指有为、无为诸法各自特有的相状(自相)皆空无自性。在经典中,“自相”是指诸法各自所呈现的特有属性与功能,如色的“坏相”或“恼坏相”、受的“受相”或“能受相”等。而“自相空”则是指这些特有相状本质上皆是空寂的,呈现出“非常非滅”、“非積聚”、“不可壞”、“不可取”等法性特征。这种空性并非外力使然,亦非修行者智慧所作,而是由于“性自爾”或“諸法性爾”,即一切法的本性本来如此。二、主要阐述:在经典论述中,自相空被广泛应用于对一切法、修行实践以及众生解脱与成佛关系的阐释中。首先,自相空的范围涵盖了有为与无为的一切法。从五阴(五蕴)、眼等六根、色等六境、六识、六触,到因缘生受、六波罗蜜,乃至内空至无法有法空、四念处至十八不共法,以及菩萨自身,其自相皆是空的。这种自相空具有独特的法性特征:它与虚空等同,无所有;在自相空中,不生不灭、不垢不净,前际与后际皆不可得;它无所取、无所舍,且在自相空法中,实际上无众生、无业因缘、无果报。其次,自相空是菩萨修行实践的核心指导原理。菩萨之所以能“無大莊嚴為大莊嚴”,正是因为诸法自相空。阿惟越致(不退转)菩萨正是以此自相空法入菩萨位,得无生法忍。菩萨在行六波罗蜜等助道法时,因观一切法自相空,了知其“無生、無定相、無所轉”,入诸法实相,从而不生布施想、受者想等,亦不受世间果报,以此方便力增益善根、救度众生。菩萨行深般若波罗蜜时,以方便力对诸法不取相亦不坏相,因为知一切法自相空,并住于自相空中,入空、无相、无作三三昧来成就众生。菩萨虽善学自相空,但能于观空时不作证,使得证法与证者皆不可见。由于了知一切法与虚空等无所有、自相空,菩萨行自相空法则无所著,亦不贵色、相、六度等一切法。在修行般若波罗蜜时,应行诸法自相空,而这种修行以“不行”为最高境界,即“不行是名行般若波羅蜜”。最后,自相空与众生的解脱及成佛有着直接的关联。众生因为实不知、不见、不解诸法自相空,因而产生颠倒妄想,在无所有法中分别得法,作业因缘,从而往来五道生死不得解脱。菩萨正是因为众生不知诸法自相空,才发意求阿耨多羅三藐三菩提,并以大誓庄严,为众生显示助道法、说四圣谛以令其解脱。经典甚至直接宣说:“諸法自相空即是阿耨多羅三藐三菩提”。观诸法如实相即是观“自相空”,菩萨以此智慧观一切法空,无法性可见,住此性中即可得阿耨多羅三藐三菩提。三、不同部类与译本的表述差异:在不同部类和译本中,对于“自相”的具体内涵和相关术语的翻译存在明显的差异。首先是五蕴的指代与特征表述:在般若部《摩訶般若波羅蜜經》(《摩訶般若波羅蜜經》)中,指代五蕴时使用的是“五蔭”这一术语,其对五阴自相的表述为:“色壞相、受受相、想取相、行作相、識識相”。而在大集部《大方等大集經》(《大方等大集經》,昙无谶译)中,同样将五蕴译为“五陰”,但其对五阴各自特征(自相)的表述则更为独特,具体为:“惱壞是色相、能受是受相、取相是想相、造作是行相、了知是識相”。其次是空性的法理表述:《摩訶般若波羅蜜經》强调自相空的本质是“非常非滅”,因为“性自爾”;而《大方等大集經》则强调自相空具有“非積聚”、“不可壞”、“不可取”的特点,其根本原因在于“諸法性爾”。四、与相关概念的关系:首先是与“性空”及“自法自法相空”的关系。在《大方等大集經》中,“自相空”与“性空”、“自法自法相空”等多种空理并列。其中,“性空”是指一切有为无为法性,非声闻、缘觉或如来所作,其法性本空;“自法自法相空”则指诸法自法皆空,且“是空非智作非見作”。这些空理共同构成了对法性的完整观察。其次是与“虚空喻”的关系。经典中常以“虚空”为喻来辅助说明自相空的道理。如《大方等大集經》指出,诸法性如虚空,无高无下、无生无灭、无增无减;心性亦同虚空般“无相”,“相及無相,法性俱無”。这种虚空喻与自相空中关于一切法自相“非积聚不可坏不可取”的论述在法理上高度一致,皆旨在引导行者体悟诸法无性无相的真实法性。在《摩訶般若波羅蜜經》中,亦强调诸法自相空与虚空等同,无所有。最后是与“般若波羅蜜”及“阿耨多羅三藐三菩提”的关系。《摩訶般若波羅蜜經》中指出,般若波罗蜜本身亦是因自相空而不生不灭的。同时,“諸法自相空即是阿耨多羅三藐三菩提”,观诸法如实相即是观自相空,住此性中即可成佛。五、代表性原文引用:《摩訶般若波羅蜜經》:“何等名自相空?色壞相、受受相、想取相、行作相、識識相。如是等有為無為法各自相空。是空非常非滅,何以故?性自爾。是名自相空。” 《摩訶般若波羅蜜經》:“諸法自相空即是阿耨多羅三藐三菩提。何以故?是自相空中,無生無滅、無垢無淨。” 《大方等大集經》:“惱壞是色相、能受是受相、取相是想相、造作是行相、了知是識相。如是有為無為一切法自相,是自相空。是空非積聚、不可壞、不可取,何以故?諸法性爾,是名自相空。” 《大方等大集經》:“一切諸法性如虛空,無高無下、無生無滅、無增無減……心性亦爾,同於虛空,無有相貌。相及無相,法性俱無。”

By SutraAI-generated

入中論善顯密意疏B0044 · 藏傳論典部

《入中論善顯密意疏》以「變礙等無性,是為自相空」略標此義:色蘊之自相是「有變礙」,「等」字則由此等取乃至一切種智;一切染法、淨法各有其各別自相,而此等自相皆無自性,即名「自相空」。本論在此明用「色蘊」而非「色陰」,並以「自相空」為固定術語。

廣釋時,本論總攝有為與無為二類,說「若有為自相,及無為自相,彼由彼性空,是為自相空」;亦即有為法與無為法的自相,皆由其自身之自性而空。其術語形式兼用「自相」與「自性」,著重「彼等自相即由彼自性空」,不是另由外在之空使其成空。

本論更從中道觀察申明:若色、受等自相真是由自性成立而又依因緣生,則觀行者現證自性空時,便會變成先有諸法、後由根本智加以破壞;如此即等於說見空性是毀壞諸法自性的原因,如錘擊壞瓶,於理不合。因此,諸法本來全無自性,不應許有自性生;若許「有自相生」,即使辯稱此自相不必為現見真實義的聖智所見,仍不能免於「有自相即成實有」之失。

為顯明「自空」的方式,本論引文說,中道正觀不是「以空性令諸法空」,而是「法性自空」;無相、無願、無作、無生、無起亦同此說。據此,本論解釋:觀察諸法自性時,須從諸法自體上空,方是「自性空」,並稱此亦即「諸法自相空義」。若諸法本具自相體性,便不能說法性自空;若不從自體破除自性,反以另一法之空稱其為空,也違背「不以空性令諸法空」之意。

本論同時否定「瓶以瓶空」這種對自空的解釋:若瓶以瓶而空,便會推出瓶中無瓶;若自身之法上沒有自身之法,而他法上亦沒有此法,瓶乃至其餘一切法都將成為畢竟無。因此,此處的「自相空」不是說事物沒有自身名相所指之法,而是說其各自特相無自性、由自身自性而空。

在相鄰分類中,本論先說眼等六根界、眼識等六識界、色等六境界,以及六觸、六受、有色、無色、有為、無為等一切法,皆由其自性遠離而空,名「一切法空」,繼而另立「自相空」一科;又解釋「自性」為諸法之本性,此本性非聲聞等所造,諸法本性本來如是,而此法性自性本身無有自性,故名「自性空」。由此可見,本論分別使用「一切法空」「自相空」「自性空」諸名,不將它們僅以單一名稱混稱。

摩訶般若波羅蜜經T0223 · 般若部

《摩訶般若波羅蜜經》(後秦鳩摩羅什譯)對「自相空」的論述,散見全經而以《具足品》一段為最明確定義,要點如下:

一、定義與十八空之定位。經以自相空為十八空之一,給出明確界說:「自相名色壞相、受受相、想取相、行作相、識識相,如是等有為無為法各各自相空,非常非滅故。何以故?性自爾。是名自相空。」 色以壞為相、受以受為相、想以取為相、行以作為相、識以識為相,乃至有為無為諸法「各各」有其自相而自相本空。

二、列舉式的空觀方法。經中屢以「色,色相空;受想行識,識相空。眼,眼相空;乃至意,意相空」 的列舉格式反覆施設;又如「應觀色,色相空;應觀受想行識,識相空……乃至應觀自相空,自相空相空」、「菩薩摩訶薩行般若波羅蜜時,應行諸法自相空」,顯示自相空乃深入諸法自身之空,而非諸法之外的空。

三、自相空與般若波羅蜜的關係。經云「般若波羅蜜不生不滅,自相空故」,以自相空證成般若波羅蜜之不生不滅;又云「菩薩摩訶薩應以自相空法行般若波羅蜜」,明示自相空是菩薩行般若所應安住之法。

四、自相空即是阿耨多羅三藐三菩提。經作等體之判:「諸法自相空即是阿耨多羅三藐三菩提」,直接以自相空等同無上正等正覺。

五、自相空與不退轉菩薩。經云「是阿惟越致菩薩摩訶薩以是自相空法,入菩薩位,得無生法忍」;又云「一切法自相空。不見可貴法、能生貴心者。何以故?是一切法與虛空等,無所有、自相空」,以自相空為不轉之相貌。

六、六波羅蜜行中的自相空觀。經於檀那乃至般若六度,皆貫穿自相空觀:「觀一切法自相空,無生、無定相、無所轉,入諸法實相,所謂一切法無作、無起相」;「知諸法自相空」一句於每一波羅蜜中重出,作為菩薩雖行助道而不取著之根據。

七、自相空與取捨、因果。經云「諸法自相空,無所取、無所捨」;「自相空法中無眾生,無業因緣,無果報」;「觀諸法空……自相空。是菩薩用如是智慧觀一切法空」,明自相空中本無眾生、業、果報之別,又因眾生不知,故菩薩以方便力差別說法。

八、用語詞特色。此經以「五蔭」稱五蘊(如「法名五蔭,五蔭空」),以「薩婆若」表一切智,以「阿惟越致」表不退轉,以「檀那波羅蜜」表布施波羅蜜,皆鳩摩羅什譯場之通譯。值此經中,自相空之說除極少處或作「自性空」 為異文外,全經一致用「自相空」一詞。

大方等大集經T0397 · 大集部

《大方等大集經》對「自相空」的論述,是在一系列「空」的次第展開中提出的。在「性空」之後,經文以「如是行者應如實知何者名為自相空?」作為提問,引出本段。

此經界定「自相空」,以五陰各別之特相作為說明的入手:「惱壞是色相,能受是受相,取相是想相,造作是行相,了知是識相。」具體而言,色的自相為惱壞(變壞),受的自相為能受(領納),想的自相為取相(取著),行的自相為造作(遷流),識的自相為了知(覺了)。每一法有其自相,而此自相本空。

此經進一步指出,「自相空」之範圍涵蓋「有為無為一切法」,即不僅生死流轉中之有為法無自相,連出世之無為法亦同樣無自相可執。此處用了三層遮詮來描述其體性:「非積聚、不可壞、不可取」。意為此空既非由諸法積聚所成,亦不可被破壞,亦不可被執取。此三句反覆出現於經文各段對「空」之說明中,形成固定表述格式。

經文以「何以故?諸法性爾」作為歸結——因為諸法的本性(性)本來如此,故名為自相空。此句為「是名自相空」之總結根據,亦是全段反覆出現的結論語。可見此經以「性爾」(本性自然如此)作為空之成立的究竟理由,而非以觀智或推求為之。

在整段結構上,此經先以「性空」作總說,再依次鋪陳自相空、一切法空、不可得空、無法空、有法空、無法有法空、法法相空、無法無法相空、自法自法相空等,形成一組對「空」的層層細分。「自相空」位居第二,介於「性空」之總與「一切法空」之別之間。

值得留意者,此經論空所用術語為「五陰」(見「法名五陰,五陰空」之句),而非「五蘊」;於「自相」一詞,亦未見其他譯名異說。此經並未為每一種空各立長篇解說,而是以同一結構——定義加上三句遮詮(非積聚、不可壞、不可取)加上「諸法性爾」之理由加上「是名○空」之名稱——反覆展開,使「自相空」之論述呈現出簡明而格式化的面貌。

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