What This Concept Is About
If we compare the predicament of sentient beings in birth-and-death to a car that never stops driving, then when Buddhism discusses "defilement" (杂染, saṃkleśa), it is not merely concerned with who sits in the car (that is 烦恼杂染 kleśa-saṃkleśa, "defilement of afflictions") or who is stepping on the accelerator (that is 业杂染 karma-saṃkleśa, "defilement of action"). Rather, it wants to clarify a more basic question—how does this car's drive shaft transmit kinetic energy from the past to the present, and from the present to the future? This drive shaft is 流转 (pravṛtti, "flow"); and because it is itself defiled, opposed to liberation, the two are combined as "流转杂染 (pravṛtti-saṃkleśa, 'defilement of flowing')."
This is a highly distinctive classification within the Yogācāra school (瑜伽行派), found in the《瑜伽师地论》(Yogācārabhūmi-śāstra) and the《显扬圣教论》(Prakaraṇāryavāca-śāstra). Both treatises first divide defiled dharmas into three great categories: 烦恼杂染 (kleśa-saṃkleśa), 业杂染 (karma-saṃkleśa), and 生杂染 (jāti-saṃkleśa, "defilement of rebirth"). 生杂染 in turn has four aspects—差别 (distinction), 艰辛 (hardship), 不定 (indeterminacy), 流转 (flow)—and here "流转" is one aspect of 生杂染. But the same treatise elsewhere lifts "流转杂染" out as its own category, listed alongside 烦恼杂染 and 业杂染 as three. The reader easily gets stuck at this point, so let me first clarify the relationship: "流转" was originally one of the four aspects of 生杂染; when the treatise masters pursued the question "how is it that the flow can continue without interruption," they pulled it out and made it a category of its own, devoted specifically to discussing the structural power that allows birth-and-death to persist.
So what is the essential nature (体性) of 流转? The treatise defines it explicitly as "诸行因果相续不断性" *("the nature of conditioned dharmas' causes and results continuing without interruption")*. Note that every word here is a keyword: "诸行"—all conditioned, dependently arisen activities; "因果"—where there is a cause there must be a result; "相续不断"—no genuine break in between. This does not mean that a particular thought or a particular action is itself called 流转; rather, the invisible connecting line between thought and thought, between action and result, between this life and the next—that is what is called 流转. So 流转 is by nature structural, temporal, structural.
Based on this definition, the treatise opens up multiple distinctions, and I must honestly list them all, otherwise this concept gets flattened:
- 种子流转 (seed-flow): how the karmic seeds stored in the 阿赖耶识 (ālaya-vijñāna, "storehouse consciousness") turn and continue to the present. - 自在势力流转 (flow of autonomous power): although an action has already been performed, when its conditions mature it functions automatically, like water arriving when the channel is complete. - 种果流转 (seed-and-fruit flow): the driving process between seed and fruit. - 名流 (name-flow, covering the four non-form aggregates: 受 vedanā, feeling; 想 saṃjñā, perception; 行 saṃskāra, formations; 识 vijñāna, consciousness) and 色流 (form-flow, covering the ten form sense-bases and the form included in the dharma-base): the continuity of mental activity and the continuity of material phenomena each constitute a kind of flow. - 三界之流流转 (flow of the three realms): the desire realm, the form realm, and the formless realm each have their own flow. - 三受、三性之流流转 (flow of the three feelings and three natures): the three feelings of pain, pleasure, and neutrality; the three natures of good, evil, and indeterminate—each has its flow. - 顺流流转与逆流流转 (with-the-stream flow and against-the-stream flow): flowing along the direction of dependent origination (as in the forward contemplation of the twelve links) is the stream of birth-and-death; flowing against dependent origination (as in the cessation path) is the reverse stream of the path leading to cessation—but even the path uses "flow," only in a different direction.
In sum, whatever continuation of conditioned dharmas and their results is uninterrupted may all be called 流转. This turns 流转 from "a certain thing" into "a structural property."
Next is the most distinctive part—九根本句 (nine root sentences). The Yogācāra school uses nine root sentences to encompass the three kinds of defilement:
- 业杂染 (karma-saṃkleśa): 贪 (rāga, greed), 瞋 (dveṣa, hatred), 痴 (moha, delusion) — the three unwholesome roots (three root sentences). - 烦恼杂染 (kleśa-saṃkleśa): 常 (nitya, permanence), 乐 (sukha, pleasure), 我 (ātman, self), 净 (śuci, purity) — the four inversions (four root sentences). - 流转杂染 (pravṛtti-saṃkleśa): 无明 (avidyā, ignorance), 有爱 (bhava-tṛṣṇā, craving for existence) — two root sentences.
Special attention here: 流转杂染 is rooted not in "greed, hatred, delusion" nor in "the four inversions," but in 无明 and 有爱. Why? Because the problem 流转 must solve is "how to keep the continuation going," and the two most primordial forces are: not knowing the truth (无明) and craving for existence itself (有爱). The former is not seeing clearly; the latter is clinging tightly. Without these two, the causal chain of defilement cannot join up.
Even more interesting is the treatise's distinction between householders and renunciants: 由无明门，诸出家者能生种种流转杂染；由有爱门，诸在家者能生种种流转杂染 *"Through the gate of ignorance, renunciants generate all manner of flowing defilement; through the gate of craving for existence, householders generate all manner of flowing defilement."*
This is not saying that renunciants have only ignorance and householders only craving for existence; rather, it marks a structural difference—householders, because they must establish and maintain worldly life (family estate, marriage, property, social relations), have their flowing defilement driven mainly by "craving for 'existence'"; renunciants have nominally set these down, but as long as they have not truly seen dependent origination, as long as they still think there is a "self" to be realized and a "nirvāṇa" to be entered, the deep driving force remains "ignorance." This layer of analysis is especially important for contemporary people, because most of us swing between the two states: sometimes pulled along by craving for existence like householders, sometimes led by seemingly transcendent ignorance like renunciants.
From the angle of rebirth-continuation, the concrete manifestation of 流转 is this: based on the 中有 (antarābhava, "intermediate state," the transitional stage between death and rebirth), taking the place where one is about to be reborn as its object, a defiled mind arises, making "生有相续" *("the continuation of rebirth-existence")*. Thus one undergoes birth-and-death in the four modes of birth—egg-born, womb-born, moisture-born, and apparitional—flowing among the three realms (欲界, 色界, 无色界: desire, form, formless) and the five destinies (五趣, pañca-gati) including the hells. The treatise summarizes this passage with the three words "若死、若生、若处所" *("whether death, whether birth, whether place")*—death, birth, and the place of birth: three matters that bring 流转 down from abstract causal continuity to a visible picture of sentient beings drifting through time and space.
Finally, the pivot of the defilement-purity transformation of the basis (转依, āśraya-parāvṛtti): 若于诸行流转杂染、清净因缘及清净体不如实知，便生种种杂染差别；如实知则转得清净 *"If one does not know as it really is the flowing defilement of conditioned dharmas, the causes of purity, and the substance of purity, then various differentiated defilements arise; knowing as it really is, one turns to purity."*
In other words, the reason 流转杂染 can persist is not that "something" is flowing, but that there is "not-knowing-as-it-really-is" (不如实知) regarding this whole mechanism of flow—you do not see clearly how it operates, so it keeps operating. Once you know it as it really is, once you see it, it turns to purity. This point also resonates with the fundamental spirit of the《心经》(Prajñāpāramitāhṛdaya-sūtra, Heart Sūtra): 「照见五蕴皆空，度一切苦厄」 *("illuminatingly seeing the five aggregates as empty, crossing over all suffering and calamity")*—照见 (illuminating vision) is a structural insight, not a piecemeal treatment aimed at a single thought.
A Walk-Through in Everyday Life
To keep this concept from remaining at the level of terminology, I want to walk through a scenario that a contemporary person has very likely experienced, step by step.
Scenario: Person A has worked at a company for five years. For the past two years he has kept feeling that "something is off," but he has never quit. Every morning he opens his eyes and does not want to get up; on weekends he dreads Monday, but he cannot name any specific thing that causes him pain. Scrolling social media and seeing former colleagues start businesses, change careers, or emigrate makes him anxious for a while; a few days later he comforts himself with "things are fine as they are." He plans to "wait until I've saved enough money," "wait until the kids' schooling is settled," "wait until the mortgage is paid off"—but these "laters" never arrive.
Now let us use the structure of 流转杂染 to walk through this utterly ordinary life experience:
Step one, look from the layer of 烦恼杂染 — Person A's present dissatisfaction, anxiety, and avoidance are an interweaving of the four inversions: he takes this job as "security" (inversion of pleasure), takes the stable job as "I should persist" (inversion of self), takes the system as "something that can last" (inversion of permanence), and takes the occasional small happiness as "life should be like this" (inversion of purity). This is the visible psychological layer.
Step two, look from the layer of 业杂染 — greed, hatred, and delusion are indeed present: fear of loss (greed), anger at the system (hatred), and inability to think clearly about his own situation (delusion). These also drive behavior: scrolling the phone, complaining, working overtime, social engagements.
Step three, look from the layer of 流转杂染—this is precisely what this concept is meant to bring into relief. Notice that Person A is still here not because he suddenly decided this morning to stay, but because "诸行因果相续不断" (the causes and results of conditioned dharmas continue without interruption). The causal chain of this matter might look like this:
- The decision he made when he joined five years ago (karmic seed), - The colleague relationships, client relationships, salary structure, and professional reputation accumulated over these five years (种果流转), - The mortgage, the children's tuition, the parents' expectations (自在势力流转), - Each thought of "just hold on a little longer" (名流转), - Weight gain, insomnia, muscle tension (色流转), - All strung into one uninterrupted line.
The reason this line can continue is not greed, hatred, and delusion, but two deeper roots: 无明 (he does not actually know what "happiness," "achievement," and "stability" really point to in the present moment) and 有爱 (his craving for "existence" itself—having a job, having a house, having a family, having a social position). 有爱 is especially evident here—he is not particularly devoted to this job, but "cannot be without" the life structure this job represents. This is precisely the contemporary face of the word "有爱."
Step four, look at the concrete working-out of "householders via the gate of 有爱". Person A is a standard householder. His flow is not driven by "I seek liberation" (that would be the renunciant's typical ignorance), but by "I must hold on to what I already have." Behind every "later" is 有爱 moistening and generating—love of this home, this identity, this class, this future possibility.
Step five, look at the turning point of "如实知" (knowing as it really is). If on some night Person A truly stops and sees this causal chain clearly—not with the vague self-encouragement of "I need to try harder," but clearly seeing "what is pushing me, why I am being pushed, which layer of force is pushing me"—this "seeing clearly" itself is cutting off the flow. 流转杂染 fears not suffering but being seen. This is also why the treatise says "如实知故，能令清净" *("because of knowing as it really is, one can become pure")*.
There are two places where the mapping most easily goes wrong, and they need to be pointed out:
1. Mistaking 流转杂染 for "afflictions." Many readers, upon encountering 烦恼杂染, assume 流转杂染 is its synonym. In fact, 烦恼杂染 deals with "present wrong cognitions and emotions," while 流转杂染 deals with "how these errors are woven into a causal chain and continue themselves." It is like distinguishing "the anger of this moment" from "why the anger still appears in another form ten years later"—the former is affliction, the latter is flow.
2. Mistaking 流转杂染 for "fate" or "karmic destiny." Flow is not fatalism—it is "uninterrupted continuation," a structure that can be seen and, once seen, changed. The Yogācāra school made it into a separate category precisely because it is an object that can be discerned and transformed.
Another scenario: Person B is a freelancer with unstable income, always "next month will be better." He does not smoke or drink heavily, runs three times a week, and looks very disciplined on social media. But he finds that every three months or so he falls into a trough—loses a project, has a cold war with friends, develops some minor health problem, then inexplicably climbs back up, in a repeating cycle.
What is the flow here? It is the assumption "I can control myself" (a deformation of ignorance—he takes it for autonomy, but it is actually another form of grasping at self) plus "next month will be better"—craving for the future (有爱 moistening and generating). Each trough is not a random event but a node in this causal chain arriving. When he thinks "this time was just bad luck," he is actually deepening ignorance; when he assumes "next month" will automatically deliver, he is driving 有爱.
A third scenario comes even closer—the use of meditation apps itself. Many people download a meditation app, buy the course, stick with it for a few days, break off, blame themselves, download again, in a loop. This little loop is a miniature version of 流转杂染: "I want to become a calm person" (无明—thinking there is a "self" that can become some state) + "I want to possess that calm" (有爱). Then meditation turns from "observing suffering" into "clinging to calm," and the causal chain connects.
Why Contemporary People Need It
This concept matters to contemporary people precisely because we live in an age where flow has been highly industrialized and engineered to be extremely smooth.
The information stream of smartphones, the algorithms of social media, the compounding interest of credit cards, the auto-renewal of subscriptions, the black hole of urban commuting time, the self-justification of overtime culture—each of these modern mechanisms is an industrialized version of 流转杂染. They do not attack you with greed, hatred, and delusion, but weave you in through "uninterrupted continuation." Contemporary suffering is often not some enormous evil but structural, frog-in-boiling-water continuation—this is precisely the form 流转杂染 excels at.
Neuroscientists have found that the brain's Default Mode Network (默认模式网络) continues self-narration, self-evaluation, and self-continuation even when there is no task—this network keeps the story of "me" going without end. Brain scientists have also observed the default effect (预设效应), which makes people tend to maintain the status quo and avoid change. These studies describe the physics of 流转杂染, but they do not tell us how this mechanism grows from the two roots of "无明" and "有爱," how it divides into the householder and renunciant forms, or how it can be transformed under the act of "如实知." This is precisely the unique analytical direction of Buddhism: neuroscience tells you "how the flow operates," while the concept of 流转杂染 tells you "how the flow is seen and stopped."
The "flow" (心流) in psychology is a concept proposed by Csikszentmihalyi, referring to the immersive state when a person is completely absorbed in an activity. This "flow" is a clear, undefiled flowing—it is not 流转杂染, but a manifestation of pure flow (流转清净). The Yogācāra school distinguishes finely: flow itself is a neutral structural property (诸行因果相续不断性), but with 无明 and 有爱 as its roots it is 流转杂染; with wisdom and renunciation as its roots it is pure flow. Contemporary psychology may not draw this distinction, but the contrast between "心流" and "流转杂染" can help us see: flow is not always suffering, but 流转杂染 is always suffering.
For contemporary people, the most direct help of this concept is—it teaches us to distinguish "what I am doing" from "what is pushing me." The former is present action (业杂染); the latter is the deep structure that allows action to continue (流转杂染). When we can discern which are "my decisions" and which are "the continuation of 流转杂染," we are no longer the person being pulled by the car while mistakenly believing we are the one driving. This is a structural freedom, not a change in a single behavior, but the liberation that comes when the entire drive shaft is seen.
This also answers why 流转杂染 must be rooted in 无明 and 有爱—all those defilements that can be cut off by willpower (业杂染, 烦恼杂染), if their roots (无明, 有爱) are not seen, will grow another one the moment one is cut. This matches closely the contemporary experience of "can't quit staying up late," "can't quit scrolling the phone," "can't quit a relationship"—you can control a single behavior, but you cannot control the chain that makes behaviors arise one after another.
Common Misreadings and Clarifications
Misreading one: 流转杂染 is just "afflictions." This is the most common confusion. In the《瑜伽师地论》and《显扬圣教论》, 烦恼杂染 is a category parallel to, not contained in, 流转杂染. 烦恼杂染 has the four inversions 常、乐、我、净 (permanence, pleasure, self, purity) as its root sentences; 流转杂染 has 无明 and 有爱 as its root sentences. 烦恼杂染 deals with "present wrong cognitions and emotions"; 流转杂染 deals with "the structural power that strings these errors into a causal chain." Conflating the two makes us think that handling one intense emotion handles the flow—the result is treating the symptom, not the root.
Misreading two: 流转杂染 is just "karmic retribution." 业杂染 has the three unwholesome roots of greed, hatred, and delusion as its root, dealing with the defilement of specific constructed actions. 流转杂染 is the more basic structure that allows karma's cause and effect to continue. Karma is stepping on the accelerator once; flow is the drive belt that keeps the car sliding forward. If you look only at karma, you cannot see why the same kind of action appears in another form ten years later; only by seeing flow can you understand why a person is still flowing even when "the karma is exhausted."
Misreading three: 流转杂染 = 轮回 (saṃsāra). 轮回 is a description at the level of result (being reborn in various places); 流转杂染 is a description at the level of cause (the power that makes this rebirth-continuation go on). The treatise does use "若死、若生、若处所" to describe the concrete manifestation of flow, but this is only the result, not its essence. The weight of 流转杂染 falls on "why it can continue," not "what the content of the continuation is."
Misreading four: Because householders are driven by the gate of 有爱, being a householder is evil and being a renunciant is good. This is a severe narrowing of the text. The treatise says "由有爱门，诸在家者能生种种流转杂染；由无明门，诸出家者能生种种流转杂染" *("through the gate of craving for existence, householders generate all manner of flowing defilement; through the gate of ignorance, renunciants generate all manner of flowing defilement")*—both are within the flow; the difference is only which root drives the flow. This division is not a moral ranking but a structural analysis. In fact, the treatise implies: if a renunciant thinks "I have left home, so I have cut off the flow," he is precisely caught by ignorance—thinking there is a "self" that can be liberated. So the real danger is not the identity of "householder" or "renunciant," but whether one keeps seeing the two roots of 无明 and 有爱.
Misreading five: 流转杂染 is a state that one can "enter" or "leave." 流转杂染 is a structural property (诸行因果相续不断性); whether it exists does not depend on "whether you are aware of it," but on "whether it has been known as it really is." "如实知" is the pivot of transformation—not forcibly cutting off the flow (which would fall into another kind of construction), but seeing clearly how it operates. As the《瑜伽师地论》says, "不如实知" lets 流转杂染 continue, and "如实知" can bring purity. This "如实知" is itself the antidote to 流转杂染—not an opposing force, but the force of seeing.
Misreading six: 流转杂染 is only a matter of past and future lives, unrelated to present life. The treatise says flow is "诸行因果相续不断性," and this "诸行" includes not only past and future lives but also the connection between each present thought and the next. When this afternoon we make a decision, tomorrow change our mind, and the day after reverse it again—this miniature loop is 流转杂染 operating in the present. Understanding it only as "past and future lives" makes us lose the ability to be aware of the flow most immediately visible to us.
Finally: The deepest value of the concept "流转杂染" is not that it gives us a new term, but that it invites us to see clearly a structure we have always lived with yet rarely noticed. We are not to destroy flow (flow itself is a neutral structure), but to do the work of seeing clearly at the two roots of "无明" and "有爱." When these two roots are seen, the continuation of flow operates in a new way—no longer being pushed along in a daze, but seeing clearly how it arises, and already different in the seeing. This is the real meaning of the defilement-purity transformation (染净转依): not changing place, not changing life, but letting the drive shaft turn from "non-self-aware defilement" to "observable purity."