What This Concept Is Saying
In the Buddhist vocabulary most contemporary readers encounter, words like 心 (*xīn*, "mind" or "heart") tend to stay vague. In Mahāyāna texts and treatises, however, 心 is not one undifferentiated thing. It has depth. And the concept of 妄心 (wàngxīn) — literally "false mind" or "deluded mind" (Sanskrit: *mithyācitta*) — is the precise name for one specific layer of that depth: the moment-to-moment discriminating function of mind that arises from ignorance (無明, *wúmíng* / *avidyā*) and produces the entire world of self, other, and object as something that seems to be "out there."
The cleanest classical definition comes from the 《大乘起信論》 (*Treatise on the Awakening of Faith in the Mahāyāna*), attributed to Aśvaghoṣa and translated by Paramārtha in the early sixth century. The text says:
「依一切眾生以有妄心念念分別,皆不相應故說為空,若離妄心實無可空故。」
Translated: "Because all sentient beings possess an 妄心 that discriminates from moment to moment, [this discriminating mind] is taught to be 'empty' because it does not correspond [to reality]; if there were no 妄心, there would in fact be nothing to empty."
That sentence packs almost everything. Let's unpack it.
The two essential marks: 不實 (unreal) and 分別 (discriminating)
Every classical treatment of 妄心, whether in the 《大乘起信論》 or in the 《大寶積經》 (*Mahāratnakūṭa Sūtra*), circles back to two essential marks. The first is 分別 (*vikalpa*, discriminating) — specifically, 念念分別, moment-to-moment discriminating. The second is 不實 (*asatya*, unreal, false, ungrounded).
These two are not separate things stacked together. They are the inside and outside of the same operation. The discriminating function produces distinctions — self/not-self, here/there, subject/object, desirable/repulsive — and the products of that discriminating are, when inspected, *ungrounded*. They appear solid but lack independent existence.
分別 is not the same as "thinking." It refers to a more basic operation: the mind's capacity (or habit) of cutting a continuous flow into "this" and "that," of labeling, of assigning a "self" here and an "object" there, of taking a transient pulse of experience and freezing it into a noun. The 《大寶積經》 uses the term 不實妄分別 — "unreal false discrimination" — repeatedly, almost as a compound mantra. In three successive verses it says:
「不實妄分別,增長貪欲界」 「不實妄分別,增長瞋恚界」 「不實妄分別,增長愚癡界」
Translation: "Unreal false discrimination increases the realm of greed / hatred / delusion."
So 不實 is not a moral accusation. It is an ontological one. What the 妄心 produces does not have the kind of solid, independently existing being it appears to have. It is "unreal" in the sense a dream is unreal: vivid, consequential, but without self-grounded existence.
The 《大寶積經》 makes this especially sharp in a verse that deserves to be read slowly:
「煩惱垢漏習,皆想妄分別,穢污及清淨,但假名言說。」
"All afflictions, defilements, and their habitual residues are 妄-discriminating thoughts; what is called 'defiled' and what is called 'pure' are merely conventional designations."
That last line is the one that often surprises readers. The text does not say "defiled is real, pure is real." It says *both* — the language we use to mark spiritual progress — are 名言 (*nāma*, names), useful but not ultimate. This is a quiet but radical move: even our judgments about our own spiritual state are products of the discriminating mind.
What 妄心 depends on — and why this matters
Here is where a strictly secular or self-help reading of Buddhism usually goes off the rails. The 《大乘起信論》 does *not* say 妄心 is the whole story of mind. It says 妄心 *depends on* something deeper:
「心生滅者,依如來藏故有生滅心,所謂不生不滅與生滅和合,非一非異,名為阿梨耶識。」
"The arising-and-ceasing mind [i.e., 妄心] exists by depending on the 如來藏 [tathāgatagarbha, the 'womb' or 'treasury' of the thus-come one]. The union of the unborn-undying [如來藏] and the arising-ceasing [妄心] — neither one nor different — is called the 阿梨耶識 [ālayavijñāna, the 'storehouse consciousness']."
So the architecture is layered:
- 真心 (*zhēnxīn*, "true mind"): 常恒不變, 淨法滿足 — "always constant, unchanging, full of pure dharmas." This is the mind "of 離念境界" — free of discriminating thought, accessible only through direct realization. The text calls it 覺義 (*jué yì*, the "meaning of awakening"). - 如來藏 (*tathāgatagarbha*): the deeper "womb" or "treasury" out of which both 真心 and 妄心 arise. Itself unconditioned and unborn-undying, but also the very reason why 妄心 can appear at all. - 阿梨耶識 (*ālayavijñāna*): the composite that holds both 覺 (awakening, 真心) and 不覺 (non-awakening, 妄心) — "non-one, non-different" (非一非異). - 妄心 (*wàngxīn*): the moment-to-moment discriminating layer; the 不覺 side of 阿梨耶識.
The text offers a striking metaphor for this: the 心體 (mind-essence) is "originally self-pure" (自性清淨), but it has been "dyed by ignorance" (為無明所染), and from this dyeing comes "the defiled mind" (染心, *rǎnxīn*) — another classical name for 妄心.
This is the single most important point for contemporary readers to hold: 妄心 is not the totality of who you are. It is a layer. The same text that names it also insists it depends on something unstained. To reduce a person to their 妄心 is to commit the very mistake the 妄心 makes — taking a construction for a solid self.
The mutual loop with 無明 (ignorance)
If 妄心 depended only on 如來藏, the picture would be tidy but flat. What the 《大乘起信論》 adds is a feedback loop:
「以有無明染法因故即熏習真如;以熏習故則有妄心,以有妄心即熏習無明。」
"Because there is the cause of ignorance-dyeing, [it] perfuming-actuates (熏習, *vāsanā*) suchness; through this actuation, 妄心 arises; and because 妄心 is present, it in turn perfuming-actuates ignorance."
The technical term 熏習 (literally "perfuming and practicing," used here in the sense of deep, continuous, subtle conditioning) matters. It is not a single cause-effect link; it is an impregnation, the kind of thing that takes years of repeated exposure to set in. The picture is a feedback loop:
- 無明 (ignorance) → 熏 真如 (perfumes suchness) → gives rise to 妄心 - 妄心 → 熏 無明 (perfumes ignorance) → keeps the loop spinning → produces 妄境界 (illusory objects/world) - 妄境界 → 熏 妄心 → leads to clinging, action (造種種業), and suffering (受於一切身心等苦)
The text summarizes the result starkly: 「三界虛偽唯心所作」 — "The three realms are false and unreal, made only by mind." And: 「依眾生無明妄心而得住持」 — "The world is sustained by sentient beings' ignorant 妄心."
So 妄心 is not a single bad thought. It is the entire self-sustaining engine by which ordinary experience appears solid.
Inner divisions: 妄心 is not just one thing
The 《大乘起信論》 also gives a finer anatomy. Two kinds of conditioning by 妄心 are distinguished:
- 業識根本熏習 (perfuming by the karmic root-consciousness): affects even the three vehicles — śrāvakas, pratyekabuddhas, bodhisattvas — before their final liberation; they still experience arising-and-ceasing. - 分別事識熏習 (perfuming by the discriminating phenomenal consciousness): the ordinary human experience of "this object, that person, here and now" — the more obvious discriminative layer.
Underneath, the 阿梨耶識 itself is broken down into finer strands: 業識 (karmic consciousness), 智識 (wisdom consciousness), 相續識 (continuity consciousness), and 意識 (mental consciousness, also called 分離識 or 分別事識). These are not separate minds but distinguishable aspects of the same 妄心-function, working at different depths.
This matters because most readers, when they hear "mind," think only of the surface — the voice in the head commenting on the day. 妄心 is much bigger than that voice. It includes the deep conditioning that makes you wake up already being someone, with already-formed preferences, repulsions, and self-narrative. The voice is the topmost ripple; the conditioning is the current underneath.
How it ends — and how it isn't "killed"
The text is also clear that the path is not to annihilate 妄心 through force:
「以真如法常熏習故,妄心則滅、法身顯現。」
"Because suchness (真如) constantly perfuming-actuates [the mind], 妄心 is extinguished, and the dharma body (法身, *fǎshēn*) is revealed."
This is a key subtlety. 妄心 is not destroyed; it is *extinguished* in the way a dream is extinguished upon waking. The extinguishing is caused by something already present (真如), not by something we add. The practice does not build 妄心's opposite; it allows 妄心's foundation (真如) to do its work.
The 《大寶積經》 puts the same truth in the imperative voice:
「智心應遠離,若能降伏心,則能伏煩惱。」
"The wisdom-mind should be distant [from objects]; if one can subdue the mind, one can subdue the afflictions."
The surprising 文殊師利 move
And then the 《大寶積經》 makes a move that takes most contemporary readers completely by surprise. In a dialogue between Mañjuśrī (文殊師利) and the son of the gods Sudusti (善住意天子) about 初發心 (the "first arousal of the mind toward awakening"), Mañjuśrī says:
「不實句斯謂為發,是無分別句斯謂為發……無依、無取、無分別、不可生、不實之發。」
"To arouse is, by way of the 'unreal,' that is, the arousal; it is by way of the non-discriminating, that is, the arousal… an arousal without support, without grasping, without discrimination, unarising, unreal."
He is referring to what initially sounds alarming: "the arousal of the mind of greed, hatred, and delusion" (發貪恚癡心). Mañjuśrī's point is shocking: even *that* arousal, when truly seen, is "unreal, non-discriminating, unarising." Only buddhas, pratyekabuddhas, śrāvakas, and non-retrograding bodhisattvas can *truly* arouse in this way. In other words: 妄心's own mode of operation, fully penetrated, turns out to be 空 (empty).
This is the deepest classical teaching on 妄心: not that we must fight it, and not that we must obey it, but that we must *see through* its discriminating function to its 不實 character. The 《心經》 (*Heart Sūtra*) makes essentially the same point from the other direction when it says 「照見五蘊皆空」 ("illuminating, the five aggregates are all empty") — the discriminated mind and its objects, fully seen, lack the substance they appear to have.
Walking Through It in Life
The classical definition of 妄心 is precise — 念念分別, moment-to-moment discriminating, 不實, dependent on 如來藏, mutually conditioning with 無明, building the three realms. None of these are abstract. Each one maps onto something a contemporary person has actually experienced, often within the last hour. Let's walk through several scenes, slowly, and see where the mapping holds — and where it is usually misdrawn.
Scene 1: The morning commute
You step onto a crowded subway. Before you have decided to think anything, your mind has already performed several moves:
1. It compares: the woman across the aisle has better skin, a better coat, more restful eyes than you. This is 分別 — the discriminating function has produced a "self here, other there, better/worse" structure. 2. It narrates: "I'm not taking care of myself. She probably has her life together. I should be doing more." This is 妄境界 (illusory object/world) being fed back into 妄心, generating a low-grade shame. 3. It runs a prediction: "I bet she has a partner who treats her well." This is not perception; it is construction. 4. It loops: by the time you reach your stop, the comparison has been "perfuming" (熏習) your self-image for the entire ride.
In classical terms, you have just had a textbook session of 念念分別. And because the objects of that discrimination — "her," "me," "better," "worse" — were never independently existing things in the first place but were *constituted* by the discriminating itself, the whole exercise was 不實: vivid, felt, but ungrounded.
Here is the place where most people mis-map the teaching. They think: "I should not have those thoughts. I should be free of comparison." That is *not* what 妄心 means. The text says the issue is not that comparisons appear; it is that we mistake their products (the "better-her" / "worse-me") for solid, independent realities and then react to them as if they were. The discriminating function, when seen clearly, reveals itself as empty — that is the 不實 being pointed to. Trying to *kill* the thoughts is a separate (and usually futile) project that the 《大乘起信論》 does not endorse.
Scene 2: The 3 a.m. replay
You wake at 3 a.m. and a single sentence from a meeting six hours ago begins to loop. Your manager said something ambiguous; you are now running twelve possible interpretations. Each one spawns a counter-interpretation. Each counter-interpretation spawns a memory of an earlier similar comment. By 3:30 a.m. you have constructed an entire narrative about your career trajectory and your manager's opinion of you.
In classical terms, this is 妄心 operating at full strength. The original utterance is a few seconds of sound. By the time 妄心 is done, it has been inflated into a self, a manager, a relationship, a future. This is precisely 「不覺念起現妄境界」 ("non-awakening thoughts arise and illusory objects appear"). The 妄境界 then feeds back: 「熏習妄心,令其念著造種種業,受於一切身心等苦」 ("perfuming the false mind, causing it to cling, act in various ways, and undergo all kinds of bodily and mental suffering").
The "various kinds of action" here does not need to be dramatic. It can be: getting up to check email, drafting a defensive reply you will never send, lying awake rehearsing a future confrontation, showing up to work tired and slightly hostile. This is the loop closing.
The key point that often gets lost: the 3 a.m. loop is not *you*. It is a discriminating process that the text says *depends on something deeper* (如來藏). In fact, there is a noticing of the loop, is there not? Even as you suffer it, something is aware. The text's framework insists that this awareness is not the 妄心; it is what 妄心 obscures — the 真心 that the text says is 常恒不變, 淨法滿足.
Scene 3: Jealousy in a close relationship
Your partner laughs warmly with an old friend at a dinner. You are suddenly gripped by something.
If you have only self-help vocabulary, you might say: "I have trust issues" or "I am being insecure." The Buddhist analysis is more precise. What just happened is a fast cascade:
- 妄心 distinguishes: "partner," "old friend," "warm laugh," "me (excluded)." - It generates a story: "the laugh is for the friend, not for me; my partner prefers the friend; this proves something about my value." - The story is taken as real (instead of as construction), which is the 不實 functioning as if it were solid. - The three poisons fire up: 瞋恚 (anger) toward the friend, 貪欲 (greed) for the partner's exclusive attention, 愚癡 (delusion) about the actual situation.
In the 《大寶積經》's verse, this is exactly 「不實妄分別,增長瞋恚界」. Note the order: the discrimination comes *first*, and the hatred is what it produces. The hatred is real-feeling, but the discrimination is what built the situation it reacts to. This is why the text targets the discriminating rather than the emotion itself. 「非事能生欲,皆由妄想起,不實妄起欲」 — "It is not the external thing that generates desire; all desire arises from the 妄心, and the desire thus arising is unreal."
The mis-mapping that often happens here is treating 瞋恚 as the problem. It is a downstream effect. The classical work is not to suppress the anger, but to see through the discriminating that produced the object it reacts to.
Scene 4: The parenting inner narrator
A small example, but a vivid one. You watch your child struggle with a friendship. The 妄心 is already running:
- "If I handle this wrong, my child will be scarred." - "I should have noticed earlier." - "Other parents would have known what to do." - "I am failing at this part of parenting."
Each sentence is a 念念分別 — the discriminating has produced "good parent / failing parent," "child's future / my inadequacy," and so on. Each sentence has the form of a fact but is, on inspection, a story. The text would say this whole assembly is 不實, in the precise sense: the future-self-being-scarred and the present-self-as-failure have no independent existence; they were just produced by the discriminating, and they are *perceived* as facts.
The useful point — and this is what 《大乘起信論》 adds — is that you can see this without hating yourself for it. The discriminating mind is layered, deep, and not entirely in your conscious control. The text's whole architecture is to say: you are also that which can *see* the discriminating. That seeing is not the 妄心. It is what the 妄心 depends on.
Where the mis-mappings usually happen
Three places where contemporary readers get this wrong before they have even started:
1. Treating 妄心 as "bad thoughts." The text's 妄心 is not a moral category. It is the discriminating function. Without it, you could not read this page, drive a car, or recognize your friend's face. The "false" in 妄心 refers to its *products* being ungrounded (不實), not to its being something to be ashamed of. The classical remedy is not to feel bad about having 妄心, but to see its products as ungrounded.
2. Treating 妄心 as all of who you are. The 《大乘起信論》 explicitly says it depends on 如來藏 and is united (非一非異) with 真心. To reduce a person to their false mind is to commit the very mistake the false mind makes — taking a construction for a solid self.
3. Treating the practice as suppression. "Be aware of your 妄心 and don't follow it" — this is a useful preliminary, but it is not yet the classical teaching. The text's deepest move is the Mañjuśrī one: even the very "arising of greed-hatred-delusion," seen truly, is 不實, 無分別, 無生. The practice is therefore not suppression but *seeing through*. This is a different, gentler, and ultimately more thorough kind of work.
Why Contemporary People Need This
A working definition of 妄心 — moment-to-moment discriminating, mutually conditioning with ignorance, producing what feels like an independently existing world of self-and-other — would have been intelligible to any literate Buddhist in early medieval India or Tang China. Why bring it up now?
Three things about the contemporary situation make this classical teaching more, not less, relevant.
1. The narrator has more fuel than ever
Modern humans spend a remarkable portion of waking life inside self-generated narratives. The default mode network (DMN) — a set of brain regions including the medial prefrontal cortex and posterior cingulate — is most active when we are not focused on external tasks, and is associated with mind-wandering, self-referential thought, and simulation of past and future. Researchers such as Kalina Christoff, Adriana Galván, and others have proposed that a substantial fraction of waking thought is *narrative* thought: the "story of me" running beneath whatever else we are doing.
This is not, on its own, 妄心. The DMN is a neural correlate; 妄心 is a doctrinal category with a soteriological purpose. But the analogy is instructive. The contemporary person is, by structural fact, almost continuously immersed in narrative — which is precisely the 念念分別 the texts describe. The texts offer a vocabulary for what is, experientially, a *saturation* problem: not that you have more "bad thoughts," but that you have more *narrative*, and narrative is the very substance of 妄心.
Predictive-processing accounts of the brain — popularized in works like Anil Seth's *Being You* and Lisa Feldman Barrett's *Seven and a Half Lessons About the Brain* — describe perception as a top-down construction, with the brain constantly generating predictions and updating them in light of sensory input. This, too, has a structural resemblance to the moment-to-moment discriminating: the mind produces an object, checks it against input, revises. Again, it is *not* the same as 妄心 (for one, it is a neural-mechanistic account, not a soteriological one), but it provides a contemporary language for what the texts mean by the discriminating function's world-building character. The limits of these analogies matter too: neuroscience can describe the mechanisms of narrative generation, but it cannot, by itself, say anything about whether the narrative is rooted in something unconditioned (如來藏) or whether it can be extinguished in the way the texts describe.
2. Positive thinking has reached its limit
The dominant contemporary therapy culture has spent decades teaching people to *manage* their narratives — to replace negative thoughts with positive ones, to construct affirmations, to dispute irrational beliefs. These methods help. They also have a structural ceiling, and the ceiling is exactly where 妄心's classical diagnosis bites.
Positive thinking works by giving 妄心 *better material to discriminate with*. The discriminating itself — "I am successful" vs. "I am failing," "I am worthy" vs. "I am not" — is left intact. The classical teaching is more radical: it is not about getting the discriminating to produce better labels, but about seeing that *the entire labeling process* is 不實. Its products are not facts to be replaced with better facts; they are constructions whose constructed character can be seen through.
For a generation that has been trained to optimize its inner narrative, this is a meaningful pivot. It is not against self-compassion or against constructive thought. It is against the more basic assumption that the discriminated world of "self / not-self / good / bad" has the kind of solidity that warrants the energy spent defending and improving one's place in it.
3. AI as a strange mirror (with strong caveats)
Large language models are, at a certain level of description, exactly what their name suggests: large statistical engines that predict the next token in a sequence given prior tokens. They are the most extreme contemporary example of moment-to-moment production without an inner self. Each output is conditioned by what came before; nothing grounds the chain in a self-knowing center.
This is interesting because the classical Buddhist description of 妄心 is *also* moment-to-moment production without an inner self-grounding. The text says it explicitly: 「一切分別即分別自心,心不見心無相可得」 — "All discrimination is the mind discriminating itself; mind does not see mind; no characteristic can be obtained."
But the analogy has hard limits. An LLM has no 如來藏. It does not depend on something deeper; it has no deeper layer. It does not suffer; the moment-to-moment production is not, for it, a problem. And it has no access to the "extinguishing" the texts describe — because there is, in an LLM, no moment of awakening. The analogy is useful as a way of *loosening* the contemporary grip on self-narrative ("see, even a system that produces fluent self-talk does not need to be a self"), and it stops there. It does not, by itself, prove or disprove anything about 妄心.
4. The world built by 妄心 is more total than ever
The 《大乘起信論》 says 「三界虛偽唯心所作」 — "The three realms are made only by mind." This used to sound like an exotic metaphysical claim. In a contemporary moment when much of economic, political, and social reality is constituted by collective narratives — valuations, trends, reputations, viral moments, the very shape of what counts as news — the claim feels less exotic and more diagnostic. The "world" that the contemporary person is embedded in is, in measurable ways, more narrative-constituted than the world of a preliterate agricultural society. The teaching that this world is 「依眾生無明妄心而得住持」 ("sustained by sentient beings' ignorant 妄心") is not a metaphor. It is a description of a structural fact about how reality is socially held up.
This is also why the practice is more, not less, urgent. The 妄心 is being asked to do more work than ever, in an environment saturated with its productions. Tools that simply give it more material (better affirmations, more sophisticated narratives) are not enough. What is needed, classically, is the kind of seeing that allows the discriminating function to be recognized as just that — a function, not a self.
Common Misreadings and Clarifications
Even with the classical texts in hand, contemporary readers tend to misread 妄心 in a few predictable ways. Each of these is worth slowing down on.
1. "妄心" is not "evil mind."
The translation "false" or "deluded" can easily be read as moral judgment. It is not. 不實 is ontological (about how things exist), not ethical. The 《大寶積經》's language — 「不實妄分別」 — emphasizes that the discriminating mind's *products* are ungrounded, not that the discriminating mind is wicked. The same text makes the point more sharply when it says the *distinction* between defiled and pure (穢污 and 清淨) is itself 「但假名言說」 — a mere conventional designation. A moralized reading of 妄心 ("I have a bad mind and should purify it") is itself, ironically, a fresh round of discriminating.
2. 妄心 is not all of who you are.
This cannot be overstated, because contemporary readers absorb the term and immediately internalize it as identity: "I am my 妄心." The 《大乘起信論》 specifically blocks this reading by saying 妄心 depends on 如來藏 and is part of a non-one, non-different union with 真心. The 真心 is described as 常恒不變, 淨法滿足 — already constant, already pure, already full. The work of practice, on this account, is not to *build* a true self, but to allow what is already there to be recognized through the thinning of 妄心's noise. Even the famous phrase from the 《金剛經》 (*Diamond Sūtra*), 「應無所住而生其心」 ("one should give rise to a mind that does not abide anywhere"), points to the same direction: a mode of mind that is not anchored in the discriminating function.
3. 妄心 is not destroyed; it is extinguished.
The text says 「妄心則滅」, but 滅 here is not annihilation. It is the ceasing of something that was never self-existing. The image the texts repeatedly return to is the dream: the dream-objects vanish not by being fought but by waking up. The cause of the extinguishing is 真如's "constant perfuming" (以真如法常熏習故) — the deep layer is not something we add but something already present that gets to do its work. Practice, on this account, is less about *attacking* 妄心 and more about *removing the conditions* under which its products appear necessary.
4. 妄心 is much bigger than your stream of thoughts.
Because 念 (a thought-moment) is the smallest classical unit, 念念分別 sounds like a description of *thinking*. It is, but it is more. The 《大乘起信論》's distinction between 業識根本熏習 (root conditioning at the deepest layer) and 分別事識熏習 (the obvious surface discriminating) shows that 妄心 also includes deep conditioning — habits of preference, posture, attention, identity — that operate below the threshold of thought. When the text says 妄心 has 「無明」 as its co-cause, it is pointing to something more like a foundational orientation than a single belief. Contemporary readers who treat 妄心 as "the voice in my head" are tracking only the surface ripple.
5. The opposite of 妄心 is not "blank mind."
The 真心 is described as 離念 (free of discriminating thought). It is *not* described as 無念 (no thought at all). A flat, dissociated, "no thoughts whatsoever" state is not the text's goal. The 離念 of 真心 is an *active*, fully awake, fully present mode of mind in which the discriminating function has ceased but awareness has not. The classical commentaries are careful about this distinction; contemporary practice teachers sometimes are not. Conflating 離念 with 無念 is a category error that turns a liberation teaching into a dissociative one.
6. Seeing through 妄心 is not the same as denying what it produces.
This is where Mañjuśrī's teaching about 初發心 is most often misread. When he says 「不實句斯謂為發」 and 「無生、不實之發」 — that even the arising of greed-hatred-delusion is "unreal, unarising" — readers sometimes take this as a kind of spiritual bypassing: "oh, it was never real, so it doesn't matter." That is exactly not the point. The classical reading is that when the discriminating function is seen through, the products of that function are *recognized as constructions*, not denied. You don't pretend the anger wasn't there; you see that the "object" it reacted to was itself a product of 念念分別. The teaching is about the kind of seeing, not about the dismissal of experience.
7. Suppression of 妄心 is not the practice.
Because 妄心 produces 三毒 (the three poisons), and because 三毒 produce suffering, the obvious contemporary move is to try to suppress the function. The texts do not endorse this. The 《大寶積經》 recommends 「智心應遠離」 and 「降伏心」, but these are not instructions to crush; they are instructions to *de-center*. The 智心 (wisdom-mind) is the same mode of awareness that sees through 念念分別 to its 不實 character — which, as we have seen, is closer to Mañjuśrī's 「無分別」 than to a clenched, suppressive will.
8. 妄心 is not only an "un enlightened" problem.
The 《大乘起信論》 explicitly says the 業識根本熏習 of 妄心 affects even the three vehicles — śrāvakas, pratyekabuddhas, and bodhisattvas — before their final liberation. 妄心 is not a stain that the enlightened do not have; it is a layer that is gradually seen through, with its function ceasing as the seeing matures. Even fully awakened beings, on this account, do not "lack" 妄心; they simply no longer operate from it. This is a more mature and less moralistic framing than "I have to defeat my 妄心 before I am acceptable."
A closing image
Imagine you are watching a film in a dark theater. The film is vivid — people, landscapes, drama, grief, joy. The classical description of 妄心 says you have been mistaking the film for the screen.
Now the important move: the screen is not somewhere else, not "behind" the film in some hidden location. The screen is what allows the film to appear at all. When the film ends, the screen does not go anywhere. 真心 is not "another mind you have to acquire"; it is the allowing-condition for 妄心's arising, which is why 妄心 depends on it (依如來藏故有) rather than the other way around. The work of practice is not to escape the theater, nor to burn the film; it is to notice, gently and repeatedly, that the film is the film and the screen is the screen — and that you have always been, in some sense, the screen.
That is not a metaphor the classical texts use. But it is, I think, a fair contemporary image for what they are pointing at when they say 「以真如法常熏習故,妄心則滅、法身顯現」.