Dharma · AI Companion

中士

madhyama-puruṣa

以自身出离生死为志向者。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 saying

中士 (madhyama-puruṣa, “the person of the middle capacity” or “middle practitioner”) is a practitioner whose governing aim is to end their own suffering and leave saṃsāra—the conditioned round of birth and death. Such a person no longer treats worldly pleasure as the final answer, but has not yet made the liberation of all beings their own comprehensive responsibility.

The word “middle” does not mean mediocre. It identifies a position between two orientations. In the threefold formulation of the *Abhidharmakośabhāṣya* (*《阿毘達磨俱舍論》*):

“The lower person diligently seeks their own happiness; the middle person seeks the cessation of suffering … the higher person constantly seeks their own suffering’s end, others’ happiness, and the permanent cessation of others’ suffering, taking others as themselves.”

The decisive phrase is 中士求滅苦: “the middle person seeks the cessation of suffering.”

Consider someone who has spent years trying to improve life by changing its contents: a better salary, a more attentive partner, a healthier body, a quieter home, a more respected identity. These may be reasonable goods. But eventually the person sees that every acquired condition remains vulnerable: pleasure changes, relationships separate, health declines, recognition cannot stabilize the self that depends on it. The question then changes from “How can I arrange experience so that it keeps pleasing me?” to “Why does experience become bondage at all, and can that bondage cease?” That change of question is the beginning of the middle orientation.

This is more radical than pessimism. Pessimism says that life contains too little pleasure; the middle practitioner sees that even pleasure cannot serve as an unconditioned refuge. The treatise explains the middle person’s aim with the phrase 非樂苦依故. In the interpretation preserved by the supplied classical entry, liberation is not grounded in either pleasure or pain. Therefore the goal is not to replace painful experience with an indefinitely pleasant experience, but to extinguish the basis of bondage itself.

This locates 中士 within the path of liberation. The lower orientation remains fundamentally directed toward one’s own favorable experience. The middle orientation develops 出離心 (niḥsaraṇa-citta, the resolve for renunciation or release): it recognizes saṃsāric existence as incapable of furnishing final security and trains for liberation. The higher orientation includes this insight but expands the field of responsibility: others’ suffering is no longer secondary to “my liberation.”

The *Yogācārabhūmi* (*《瑜伽師地論》*) makes the term more complex. It does not give one universal definition and mechanically apply it everywhere. It uses “lower, middle, and higher persons” as a comparative classification across several different dimensions. Its five perspectives must therefore remain distinct.

First, in terms of conduct, it calls both “one who practices for self-benefit without benefiting others” and “one who benefits others without practicing for self-benefit” middle persons. The first corresponds directly to the familiar definition here: the practitioner cultivates the causes of their own freedom but does not unite that cultivation with a comprehensive altruistic path. The second shows that “middle” cannot simply be translated as “selfish seeker of liberation.” One-sided altruism that neglects one’s own cultivation is also incomplete. The higher ideal integrates self-benefit and benefit for others rather than sacrificing either side.

Second, in relation to evil, the middle category includes one who commits evil without delighting in it and one who delights in evil without actually committing it. These are not the same condition. In the first, conduct is compromised while the heart resists; in the second, conduct is restrained while inclination remains corrupted. Both lie between committing and enjoying evil on the one hand, and neither committing nor enjoying it on the other. The classification registers moral transition without pretending that intention and action are interchangeable.

Third, in terms of what one gives weight to, the three are respectively described as valuing sensual enjoyment, worldly affairs, and true Dharma. Here the middle person is preoccupied with “affairs” or business rather than chiefly with liberation. This is a different application of the threefold scale: the middle term marks an intermediate priority between sensual appetite and dedication to Dharma. It should not be forced into the narrower definition “one seeking personal release.”

Fourth, in terms of what one treats as one’s proper work, the lower person makes what ought not to be done into their business; the middle person makes their own proper work their business; the higher person makes others’ welfare their own business. Here the middle person fears unwholesome conduct and cultivates their own good. They have learned moral responsibility, but have not yet taken the needs of others as inseparable from their vocation.

Fifth, in terms of meditative absorption, the three dwell respectively in defiled concentration, mundane purified concentration, and uncontaminated concentration. The middle state here is 世間清淨靜慮 (mundane purified dhyāna): genuine collectedness purified of obvious defilement, but not yet the 無漏 (anāsrava, uncontaminated) realization that cuts the roots of bondage. Calm is present; liberating penetration is not thereby guaranteed.

These five classifications are related by a family resemblance—each marks an intermediate condition—but they are not five ingredients that every historical person called 中士 must possess simultaneously. One may be ethically mature yet absorbed in worldly business; another may attain refined concentration without liberating wisdom; another may sincerely seek personal release while lacking an all-embracing altruistic vow. The term is contextual, and the criterion must be identified before applying the label.

The *Yogācārabhūmi* also portrays the discipline associated with serious departure from bondage: cultivation of ethical restraint and wisdom, concentration, mindfulness, and uprightness; the calming of sorrow and inner burning; and the opening of a way out. Its description of the true mendicant—“homeless, without possessions, without expectation, desire severed, going alone”—expresses nonappropriation rather than a romantic contempt for ordinary households. The point is that liberation cannot remain a hobby subordinated to status, gain, and social approval.

A walkthrough in everyday life

Imagine a commuter opening their phone after a painful argument with their partner.

The first impulse is to escape the feeling: scroll short videos, order something, check whether a work post received praise, or rehearse a fantasy in which the partner finally admits fault. This is the lower orientation as defined in the *Abhidharmakośabhāṣya*: effort directed toward one’s own pleasant experience. The mistake would be to call the phone itself “lower.” The classification concerns the governing aim, not the object. The same phone could be used to apologize, study Dharma, or help someone in danger.

After several minutes, distraction has produced stimulation but not freedom. The person notices a recurring structure: hurt generates craving for relief; temporary relief strengthens the habit of fleeing hurt; the next disturbance restarts the cycle. They begin to ask not merely how to feel better tonight, but how grasping, aversion, and self-protective identification keep manufacturing distress. When they turn toward ethical restraint, mindful observation, concentration, and wisdom in order to end that bondage, the middle orientation appears: 求滅苦, seeking the cessation of suffering.

This does not mean suppressing the argument or declaring, “Relationships are attachment, so I owe nobody anything.” That would confuse renunciation with avoidance. If the person refrains from sending a cruel message but inwardly savors revenge, the *Yogācārabhūmi*’s distinction is exact: the harmful inclination persists although the harmful deed is not performed. If they send the message and immediately regret it, action is unwholesome although the mind does not delight in it. Moral healing requires working with both conduct and inclination.

Suppose the person establishes a meditation routine. Their mind becomes quieter, and they can remain with the breath without compulsively reaching for the phone. This may be mundane purified concentration: valuable, lucid, and relatively free from coarse disturbance. It should not be mislabeled enlightenment. Concentration can temporarily quiet affliction without uprooting ignorance; an executive, athlete, or machine-learning engineer may develop remarkable focus while remaining deeply bound by craving and self-construction.

At work the next day, the person becomes efficient, responsible, and less reactive. They have moved from treating distraction as their business to treating their actual responsibilities as their business. In the *Yogācārabhūmi*’s “proper work” classification, that resembles the middle position. But efficiency is not automatically Dharma. If their entire life remains centered on projects, deadlines, and reputation, they may also be the middle person who “gives weight to affairs,” situated between sensual indulgence and wholehearted concern for true Dharma.

Later, a colleague asks for help. If the practitioner refuses every request on the ground that “I am working on my own liberation,” self-benefit has become one-sided. If they compulsively rescue everyone while refusing to examine their own resentment and attachment to being needed, benefit for others has become one-sided. Both patterns can fall into the *Yogācārabhūmi*’s middle category. The higher integration is neither self-absorption nor self-erasure: one cultivates the clarity that makes help wise, and helps others in ways that deepen rather than destroy that cultivation.

Finally, the person returns to the relationship. The lower question is “How can I make this person restore my pleasant self-image?” The middle question is “What craving, aversion, and appropriation make this suffering recur, and how can their causes cease?” The higher question retains that investigation but adds, “What is this other person suffering from, and how can both of us move toward freedom without my making their pain merely a device for my spiritual progress?”

The middle question is indispensable. Without it, compassion easily becomes frantic management of symptoms by someone who has never examined the machinery of bondage. But if one stops there, liberation may remain bounded by the imagined perimeter of “me.”

Why contemporary people need it

Much of contemporary life is organized around increasingly precise pleasure management. Recommendation systems learn what will keep attention engaged; workplaces optimize reward and anxiety; wellness culture can turn meditation into another technique for making an overburdened self perform more smoothly. None of these tools is intrinsically evil. The deeper problem is the unquestioned premise that a sufficiently optimized stream of agreeable experiences will finally make us secure.

The middle practitioner exposes that premise. Better conditions can reduce avoidable pain, and Buddhism does not require refusing medicine, justice, friendship, or material stability. But conditioned goods cannot perform the work of liberation. What arises through conditions changes with conditions. If identity and safety are deposited in what must change, anxiety accompanies possession from the moment of acquisition.

This perspective also protects spiritual practice from becoming sophisticated consumerism. Meditation may be marketed as better sleep, sharper attention, or emotional comfort. Those benefits can be real, but “I meditate so that unpleasant experience will stop interrupting the life I already want” is not yet the full movement of renunciation. 中士 asks whether the structure of craving itself can end—not merely whether craving can be serviced more elegantly.

AI offers a useful but limited analogy. A recommendation system can repeatedly predict which content will prolong engagement, much as habitual craving selects cues associated with reward. Yet the analogy is not an identity: a human mind is not established by this comparison to be a computer, and neither neuroscience nor machine learning has settled the Buddhist questions of consciousness, karma, rebirth, or liberation. The comparison helps us notice conditioning; it does not scientifically prove Buddhist doctrine.

The category also restores dignity to the wish for personal freedom. People sometimes hear the contrast with the higher, altruistic orientation and conclude that seeking one’s own release is morally contemptible. That is too crude. To recognize bondage, relinquish destructive pleasure-seeking, undertake ethical discipline, and train the mind toward release is an immense transformation. The middle path supplies capacities without which altruistic aspiration may remain sentimental: restraint, stability, insight, freedom from compulsive self-defense, and courage before death.

At the same time, its incompleteness matters. Personal liberation can be imagined too privately, as though “my suffering” existed independently of parents, children, workers, ecosystems, institutions, and countless beings whose labor sustains my life. The higher orientation challenges that boundary. It does not invalidate the middle person’s insight into suffering; it carries that insight beyond exclusive ownership.

Thus 中士 occupies a hinge in the liberation path. It turns the practitioner away from improving saṃsāra as though improvement alone were emancipation. It then stands at the threshold of a further transformation: from “May I be free from suffering” to a path in which the suffering and freedom of others become one’s own concern.

Common misunderstandings and clarifications

“Middle” does not mean moderately religious. A person intensely devoted to liberation may be called middle because of the scope of their aim, not because their effort is lukewarm.

It does not simply mean a selfish person. In the *Yogācārabhūmi*, even one-sided benefit for others without self-cultivation can be classified as middle. The defect is incompleteness, not necessarily indifference. Moreover, seeking one’s own liberation is already a profound departure from ordinary self-gratification.

It is not a single fixed rank of spiritual attainment. The texts apply the threefold distinction according to aim, conduct, moral inclination, priorities, proper work, and type of concentration. These criteria can diverge in one person. In particular, mundane purified concentration is not identical with the liberating orientation, and neither should be treated as proof of final realization.

“Ending suffering” does not mean chasing a permanently pleasant mood. That would reproduce the lower orientation at a subtler level. Nor does it mean annihilating a substantial person. The phrase points to ending suffering and its sustaining causes; a full doctrinal account must be supplied by teachings on dependent arising, craving, ignorance, and liberation, not by importing a fantasy of self-destruction into the word “cessation.”

Renunciation does not mean hating the body, family life, beauty, or happiness. Hatred is another form of bondage. “Homeless, without possessions, without expectation, desire severed, going alone” describes the mendicant ideal of relinquishing appropriation and dependence on worldly gain. It should not be used to shame householders or excuse abandonment of genuine responsibilities.

Helping oneself and helping others are not automatically opposed. The *Yogācārabhūmi* explicitly reveals the deficiency of either one without the other. Self-cultivation can make service steadier and less possessive; service can expose the hidden self-centeredness of one’s cultivation. The higher orientation integrates both.

中士 must also not be confused with 中有 (antarābhava, the intermediate existence). The *Abhidharmakośabhāṣya* uses 中有 for the existence arising between death and the next birth. 中士 classifies a person or practice; 中有 concerns a phase in the process of rebirth. Their shared character 中 does not make them doctrinally related.

Finally, the three persons should not be turned into labels for judging strangers. Their proper use is diagnostic: What am I actually seeking? Pleasure for myself? The end of my own bondage? Or a freedom whose scope includes others? The categories become spiritually useful when they reveal the present horizon of one’s practice—and the next horizon that practice has not yet learned to embrace.

Canonical EntryAI-generated

一、定义与核心要义

中士(madhyama-puruṣa)乃佛教修行人「三士」分类之中位,介于下士与上士之间。其核心特质在于以自身出离生死、止息苦恼为修行目标,不滞于世间欲乐之追求,亦未进至兼利他之悲愿。

二、主要阐述

中士之内涵,主要见于《阿毘达磨俱舍论》与《瑜伽师地论》两部论典,二者皆以「三士并列」之方式界定此位。

《阿毘达磨俱舍论》 以颂文扼要勾勒三士行相:「下士勤方便,恒求自身乐,中士求灭苦,非乐苦依故,上士恒勤求,自苦他安乐,及他苦永灭,以他为己故。」中士之特质在于「求灭苦」——唯以止息苦恼为务,不以追求安乐为究竟。颂文并以「非乐苦依故」一句说明理据:涅槃解脱既非以「乐」为所依,亦非以「苦」为所依,故中士之志不在乐求,而在于灭苦本身。

《瑜伽师地论》 则从五个维度同时勾勒中士之品格:

一、以行差别:论云「有自利行无利他行,有利他行无自利行,名为中士」。其中「有自利行无利他行」一类,正契「以自身出离生死为目标」之义,唯修自利之行以求己身出离,不兼修利他之行。

二、以对恶之态度:论举「行恶而非乐恶」或「乐恶而非行恶」者为中士。此二者皆介于「行恶亦乐恶」之下士与「非行恶亦非乐恶」之上士之间,属未臻纯善之过渡位。

三、以所重:论云「重受欲」「重事务」「重正法」,依次为下、中、上士。中士重心偏向世间事务,介于专重欲乐之下士与专重正法之上士之间。

四、以所行事:论举「以非事为自事」「以自事为自事」「以他事为自事」三种补特伽罗,依次配下、中、上士。中士「以自事为自事」,即怖恶行而修行自善,不同于下士之以恶行为存活资具,亦不同于上士菩萨之以利他为自事。

五、以禅定分类:论云「住染污静虑」「住世间清净静虑」「住无漏静虑」,依次为下、中、上士。中士住于世间清净静虑,虽离染污而未入无漏,正是出离之行者于染与净间之阶位。

至于中士自求出离之行相,《瑜伽师地论》以偈颂描述:「戒慧、自薰修,具定、念、正直。断诸愁、炽燃,正念、心解脱……能奖胜类生,及开出离道;住此、于此学,不惧后世死」。又别出真苾刍之相为「无家、无所、无悕望、断欲、独行」——无家宅、无所有、无希求、断欲念、独自行,正是专求出离、不顾世间家业利养之相,与「以自身出离生死为目标」之概念相应。

三、不同部类与译本的表述差异

两部论典对中士之用语一致,皆直接采用「中士」二字,未见别译或异名。

《阿毘达磨俱舍论》界定中士所用之直接用语为「求灭苦」,而非条目概念所用之「出离生死」。然「灭苦」与「出离生死」意趣相通——生死流转之根本即苦,灭除苦恼即意味着超出流转。本论之用语选择显示其论述重心在于「苦之止息」而非「生死的超越」此一表述层面。

《瑜伽师地论》则未以单一定义概括中士,而是从五个侧面反复界定,呈现此位之多重内涵。其以「有自利行无利他行」配中士,直接呼应「以自身出离生死为目标」之义涵。又以「住世间清净静虑」配中士,显示此位之行者于染污静虑(下士)与无漏静虑(上士)间之过渡性。

四、与相关概念的关系

「中士」与「中有」字同而义别——《阿毘达磨俱舍论》中另立「中有」一词,谓「于死有后、在生有前,即彼中间有自体起……二趣中间故名中有」,指死生之间的中阴身。「中有」属受生流转层面的世俗名相,「中士」则属修行阶次的出世分类,二者于本论中各有所指,宜加区辨。

「中士」与下士、上士构成三士之完整分类。下士恒求自身安乐,上士自他兼利、悲愿无尽,中士居其中位,唯求自苦之止息。三位之分野非关修证高低,而是修行取向之差异——下士以乐为趋,中士以苦灭为趣,上士以利他为归。

五、代表性原文引用

1. 《阿毘达磨俱舍论》:「下士勤方便,恒求自身乐,中士求灭苦,非乐苦依故,上士恒勤求,自苦他安乐,及他苦永灭,以他为己故。」

2. 《阿毘达磨俱舍论》:「于死有后、在生有前,即彼中间有自体起……二趣中间故名中有。」

3. 《瑜伽师地论》:「有自利行无利他行,有利他行无自利行,名为中士。」又:「『行恶而非乐恶』或『乐恶而非行恶』者,名为中士。」又:「『重受欲』『重事务』『重正法』,依次为下、中、上士。」又:「『以非事为自事』『以自事为自事』『以他事为自事』三种补特伽罗,依次配下、中、上士。」

4. 《瑜伽师地论》:「住染污静虑」「住世间清净静虑」「住无漏静虑」,依次为下、中、上士。

5. 《瑜伽师地论》:「戒慧、自薰修,具定、念、正直。断诸愁、炽燃,正念、心解脱……能奖胜类生,及开出离道;住此、于此学,不惧后世死。」

6. 《瑜伽师地论》:「无家、无所、无悕望、断欲、独行。」

By SutraAI-generated

菩提道次第廣論B0067 · 藏傳論典部

《菩提道次第廣論》以「中士夫」為主要術語,界定其為厭患一切「諸有」,為求自身利益而欲度脫三有、獲得解脫,並因此趣入解脫方便之道三種學者。論中引《道炬論》概括其相:「背棄諸有樂,遮惡業為性,若惟求自靜,說名中士夫。」故其核心志向不是追求現世或後世善趣之樂,而是厭離整個生死範圍,唯求自身寂靜解脫。

在三士道的總體建立中,本論把「決定勝」略分為二:一是僅證解脫、出生死,二是一切種智位。其中,聲聞乘及獨覺乘所說的一切法類,皆攝入「中士」或「共中士所有法類」。相對而言,下士希求後世善趣,上士由大悲而求成佛、盡除一切有情之苦;中士則以自身脫離三有為目標。這一對照清楚標示了中士志向的範圍與限度。

本論又以戒律儀說明三士差別:成就聲聞相應淨戒律儀者列為第二,即中士。其後並指出,真正引導上士時,並非令人停留於「為自利唯脫生死」的中士夫道,而是攝取與中士共同的部分,作為上士道的前行與支分。因此,本論除用「中士夫」外,尤常使用「共中士道」「共中士所有法類」「共中士之意樂」等術語;「共」字表明這些厭離生死、希求解脫的修法亦為上士進道所共同必經,而非以中士果位為最終止境。

共中士意樂的發起,以不滿足於人天善趣為關鍵。雖由念死、思惡趣、皈依及深信業果而斷惡修善,可得善趣妙位,仍不應以此喜足;因為人天勝位尚未出離行苦,若執為樂,便是顛倒。善趣之後仍可能墮入惡趣,故對善趣亦應厭患,如同厭患惡趣。對治之法,是修習諸有的苦性、不淨相與過患,以息滅從無始以來將三有盛事執為安樂所增長的癡貪。

在修心次第上,本論將「共中士道次修心」分為四項:正修意樂、衡量其生起之量、遣除相關邪執分別、抉擇能趣解脫之道性;其中正修意樂又分為明求解脫之心及發起此心的方便。這顯示中士不僅是一種身分分類,更是一套由厭離諸有、發求解脫心,直至修學解脫道的次第。

本論並以戰勝煩惱說明中士道修行的著力處:只有能戰勝煩惱,纔可稱為「勇士」;戰勝外在怨敵並不足貴,修行者應住於煩惱聚中而不受侵害,並勝伏道之所治品。全段最後以「已說共中士道次第」作結,確認本論對此概念的完整術語形式是「共中士道次第」,其實踐方向則是厭棄生死、求取解脫並摧伏煩惱。

阿毘達磨俱舍論T1558 · 毘曇部

《阿毘達磨俱舍論》論及「中士」一概念,以三士並舉的方式作出界定,將修行人依其志向分為下士、中士、上士三類,而中士居其中,以「自身出離生死」為其核心意趣。

原文以偈頌形式呈現,將三士的志向與行徑並列對照:

「下士勤方便,恒求自身樂」,此明下士之行相——下士精勤修習方便法門,恆常追求自身的安樂,以追求自利之樂為其行持方向,其所求者為「樂」且為「自身」之樂。

「中士求滅苦,非樂苦依故」,此明中士之行相與動機。中士所求者為「滅苦」二字——其意在於止息自身之苦惱,而非追求世間之樂,亦非以苦為究竟依止。「非樂苦依故」一句解釋中士之志向由來:此類行者既不以追求五欲之樂為究竟歸趣(因為世樂終歸於苦,非真實安隱),亦不以苦行修持為究竟解脫(不以苦為可依之處),而是以寂滅諸苦為其究竟志向。此處「求滅苦」三字,即為《阿毘達磨俱舍論》對中士之精要定義,與「以自身出離生死為志向者」之概念恰相契合——出離生死即是滅苦,而此滅苦之求乃專注於自身一己之出離。

「上士恒勤求,自苦他安樂,及他苦永滅,以他為己故」,此明上士之行相。上士常勤精進求兩種事:一是「自苦他安樂」,即自己承受苦惱而令他人生安樂;二是「他苦永滅」,即令他人之苦究竟永滅。「以他為己故」一句說明上士之發心:以他人之事視同己事,故能如是自苦而利他。三士之區別,在於所求對象之不同:下士求自樂,中士求自滅苦,上士則以利他為本。

就用語形式而言,《阿毘達磨俱舍論》此處以「士」為修行人之通稱,於其前加「下」「中」「上」之方位等級詞以區分三類修行人,並以四句對仗偈頌將三士之行願並列陳述,一氣呵成。中士一詞在此偈中作為獨立概念出現,並非作為五蘊、十八界、十二處等法相名數之附屬,而是就修行人之志向分類而立名。

值得注意的是,此偈以「苦」與「樂」二概念作為區分三士行願之判準:下士所求者為「樂」(自樂),中士所求者為「苦之滅」,上士所求者兼具「他樂」與「他苦永滅」三事。由此可見,中士之「求滅苦」既不滯於求樂(此為下士之求),亦不滯於以苦為究竟歸趣,而是以離苦——即出離生死——為其單一目的。這也正契於本條目對中士之界定:「以自身出離生死為志向者」。

瑜伽師地論T1579 · 瑜伽部

《瑜伽師地論》以「三士」——下士、中士、上士——的框架反覆論說「中士」一義,所引原文以「依行差別建立三士」開端,明確給出中士的定義:或有自利行而無利他行、或有利他行而無自利行者,名為中士。其中「有自利行無利他行」正與「以自身出離生死為志向者」之義契合——即專求自利而不兼利他之行相。

本經的特出之處,在於並非僅從一個面向定義中士,而是層層轉側面,列舉多種同稱「三士」的不同分類,使中士的義涵呈現多重光影:

其一,約對惡法的態度立四種補特伽羅而配三士。其中「行惡而非樂惡」(因失念、放逸、近惡友而造惡,但信諸惡能感非愛果報)與「樂惡而非行惡」(本性串習喜樂諸惡,但因親近善丈夫、聞正法、如理作意而自勉遠離),同被名為中士。前者尚有過惡現行,後者已能自制,顯示中士處於從染轉淨的中間位。

其二,約所重所尚立三士:以「重受欲」為下士,「重事務」為中士,「重正法」為上士。中士所重者為世間俗務,較下士沈溺欲樂為勝,較上士重法又遜。

其三,約「以何為自事」立三士:「以非事為自事」(行惡行以自存活)為下士,「以自事為自事」(怖惡修行善行)為中士,「以他事為自事」(菩薩)為上士。此處中士之義重在自修善行、對治自惡。

其四,在靜慮(禪定)層次上,本經以住「染污靜慮」為下士,住「世間清淨靜慮」為中士,住「無漏靜慮」為上士。中士所住者,已離染污而未至無漏,屬有漏世間之清淨定。

綜觀本經,「中士」一詞貫穿於多組並列的「三士」結構中,每一組皆以「中」為上下之間的過渡位:或就行相、或就離惡、或就所重、或就自事、或就定境。中士雖非究竟,其位卻不可或缺——於行相中能自利,於惡習中能漸轉,於定境中能離染——皆彰顯其「向上可轉、向下可墜」之中間性。

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