The eight consciousnesses are not a description of how the mind is; they are a description of what has to change. The technical name for the change is 轉識成智 — turning consciousness into wisdom — and it is one of the tidiest ideas in Buddhist thought: each of the eight, when its defilements go, becomes a specific kind of knowing, and there are four of them. The mapping is not approximate. The treatise gives it in a single sentence, in a fixed order, and that order is the thing most often mangled in English. Diagrams circulate that hand the fourth wisdom to the sixth consciousness, or attach one of the four to “thought” and another to “ideology”; the Chinese says something narrower and more interesting.
The sentence that settles it
The order, from the treatise
此轉有漏八、七、六、五識相應品，如次而得。
“These are obtained, in that sequence, by turning the defiled groups associated with the eighth, seventh, sixth and first-five consciousnesses.”
《成唯識論》卷十・玄奘譯 · Check the original (CBETA T1585)
“In that sequence” refers back to the four wisdoms just named, in their standard order. Lined up, it comes out as follows — and note where the first five sit.
| Consciousness | becomes | Wisdom | Usual English |
|---|---|---|---|
| Eighth 阿賴耶識 | → | 大圓鏡智 | great perfect mirror wisdom |
| Seventh 末那識 | → | 平等性智 | wisdom of equality |
| Sixth 意識 | → | 妙觀察智 | wisdom of marvellous observation |
| First five 前五識 | → | 成所作智 | wisdom of accomplishing what is to be done |
It is worth pausing on that last row, because it is the one that makes the scheme cohere. 成所作智 is the wisdom of getting things done, and the treatise’s definition of it is entirely outward-facing:
The four wisdoms, defined
大圓鏡智相應心品，謂此心品，離諸分別，所緣、行相，微細難知，不忘不愚，一切境相，性相清淨，離諸雜染。
“The group of mental factors associated with the great perfect mirror wisdom: this group is free of discriminations; its object and mode are subtle and hard to know; it neither forgets nor is confused about any aspect of any object; its nature and characteristics are pure, free of defilement.”
平等性智相應心品，謂此心品，觀一切法，自、他有情，悉皆平等，大慈悲等，恒共相應。
“The group associated with the wisdom of equality: this group observes all things, and self and other beings, as all equal, and is constantly accompanied by great compassion and the rest.”
妙觀察智相應心品，謂此心品，善觀諸法自相、共相，無礙而轉。
“The group associated with the wisdom of marvellous observation: this group observes well the particular and general characteristics of things, and proceeds unobstructed.”
成所作智相應心品，謂此心品，為欲利樂諸有情故，普於十方，示現種種變化三業。
“The group associated with the wisdom of accomplishing what is to be done: this group, in order to benefit and gladden sentient beings, manifests everywhere in the ten directions transformations of body, speech and mind.”
《成唯識論》卷十 · Check the original (CBETA T1585)
Read them together and the logic of the mapping shows. The eighth held everything and could not examine anything, so it becomes a mirror that holds everything and distorts nothing. The seventh did nothing but divide self from other, so it becomes the knowing in which self and other are level. The sixth sorted and judged, so it becomes sorting and judging that no longer snags. And the five senses, which were the point of contact with a world, become the capacity to act in that world on someone else’s behalf. Nothing is deleted. Each faculty keeps doing the job it was already doing, with the self-interest taken out of it.
Two of them turn early, two turn late
The turning is not simultaneous, and the Chinese commentarial tradition compressed the timing into a line that any student of the subject in Taiwan or Hong Kong can recite:
The timing, in six characters and five
故曰：六七因中轉，五八果上圓。
“Hence the saying: the sixth and seventh turn while still on the path; the fifth-and-eighth are completed at the fruit.”
通潤《成唯識論集解》卷十，明 · Check the original (CBETA X0821)
The sixth and seventh begin to turn at the first bodhisattva ground, in the middle of practice — “in the cause”. The first five and the eighth are only completed at buddhahood — “at the fruit”. There is a reason for the asymmetry, and it is structural rather than devotional: the seventh is what misreads the eighth as a self, so the eighth cannot be clear while the seventh is still working; and the five sense consciousnesses depend on faculties that the eighth maintains, so they cannot be wholly undefiled until it is. Judgement and self-regard are what a person can work on. Perception and the deep continuum change last, because they change as a consequence.
The verses everyone memorises
Most Chinese-speaking students meet this material not through the ten fascicles of the treatise but through twelve four-line stanzas, the 《八識規矩頌》, traditionally ascribed to Xuanzang and transmitted with commentaries from the Ming onward. Each group of three stanzas ends with the turning, and the four closing verses are where the four wisdoms actually live in Chinese memory:
The four turning stanzas
圓明初發成無漏，三類分身息苦輪。（前五識）
“When the perfect mirror first shines forth they become undefiled; in three kinds of manifested body they still the wheel of suffering.” — the first five
遠行地後純無漏，觀察圓明照大千。（第六識）
“After the seventh ground it is purely undefiled; observation, perfect and bright, illuminates the great chiliocosm.” — the sixth
極喜初心平等性，無功用行我恒摧。（第七識）
“At the first moment of the ground of great joy, the nature of equality; in effortless practice the ‘I’ is broken for good.” — the seventh
不動地前纔捨藏，金剛道後異熟空；大圓無垢同時發，普照十方塵剎中。（第八識）
“Before the eighth ground the store is at last let go; after the adamantine path the ripening is empty. Great mirror and stainlessness arise together, illuminating the ten directions and all their dust-mote realms.” — the eighth
《八識規矩頌》，引於憨山德清《八識規矩通說》 · Check the original (CBETA X0893)
Notice the first five stanza. Their turning is described entirely by what the mirror does — the sense consciousnesses become undefiled when the eighth does, which is the verse form of “completed at the fruit”. Notice also that the seventh’s stanza puts its turning at the very first ground, the moment of “great joy”. The system is consistent down to the level of individual lines.
Turning is not swapping
One last piece of vocabulary, because it is where English loses the argument. The umbrella term is 轉依, “turning the basis”, and the treatise analyses it into what is relinquished and what is obtained — 所轉捨 and 所轉得. What is relinquished is the defilement; what is obtained is the wisdom. The basis itself is not exchanged for a different one.
That is why nothing in the four wisdoms is a new faculty. A mirror is not a better version of a warehouse — it is the same holding, without the grasping. Equality is not the opposite of self-regard but the same comparing, with the self taken out. This is also the reason the school can insist both that ordinary experience is thoroughly deluded and that nothing needs to be added to it, a combination that reads as paradox in English and as simple grammar in Chinese.
Three ways the mapping gets reported wrongly
Giving the fourth wisdom to thought. Because 成所作智 is listed last and the sixth consciousness is the most familiar of the eight, English summaries and teaching diagrams often slide the two together, so that “the wisdom of accomplishing what is to be done” ends up as the transformation of thinking, or of “the conscious mind”, or of whatever the diagram calls its top layer. The treatise assigns it to the first five — the sense consciousnesses — and the definition confirms it: this is the wisdom that manifests bodily, verbal and mental transformations in the world, which is to say the wisdom of acting, not of considering.
Reading the list top-down. The sentence in the treatise runs eighth, seventh, sixth, five. Anything that presents the four wisdoms as ascending from the senses to the mirror has reversed the order the source uses, and usually reverses the timing with it — which then makes the mirror sound like the culmination of thinking rather than what it is: the transformation of the substrate that thinking never had access to in the first place.
Treating the four as four stages. They are four wisdoms belonging to four groups of mental factors, arising in one awakened continuum, not four rungs a practitioner climbs one at a time. There is a sequence in time — two turn on the path and two at the fruit — but it is not a sequence of four.
Where the eight come from, and why two of them keep their Sanskrit names, is set out in the eight consciousnesses in Xuanzang’s Chinese. The seventh — the one whose turning starts everything — has its own entry. And if you arrived here from a diagram that put the storehouse consciousness at the bottom of an iceberg, that comparison is examined here.
For two more terms this tradition kept in Sanskrit rather than translate, see “arhat” and “pratyekabuddha”; for a Chan verse on where wisdom comes from, see Huineng on correcting faults.
FAQ
Which consciousness becomes which wisdom?
Eighth to the great perfect mirror wisdom; seventh to the wisdom of equality; sixth to the wisdom of marvellous observation; the first five sense consciousnesses to the wisdom of accomplishing what is to be done. The treatise states the order in one sentence: “turning the defiled groups associated with the eighth, seventh, sixth and first-five consciousnesses, in that sequence”.
What does “the sixth and seventh turn in the cause” mean?
That the sixth and seventh consciousnesses begin turning at the first bodhisattva ground, part-way along the path, while the first five and the eighth are only perfected at buddhahood. The line is 六七因中轉，五八果上圓, from the Ming commentator Tongrun’s 《成唯識論集解》.
Is the great perfect mirror wisdom the same as the storehouse consciousness?
It is what the eighth consciousness becomes, not a separate thing that replaces it. The technical frame is 轉依, turning the basis, analysed as what is relinquished (defilement) and what is obtained (wisdom); the basis is not exchanged.
Are the four wisdoms unique to Yogācāra?
The scheme is developed in the Yogācāra treatises and reached East Asia in Xuanzang’s translations, but it travelled well beyond the school: the four wisdoms appear across Chan, Tiantai and Tibetan literature, which is why English readers often meet them without ever meeting the eight consciousnesses they are the transformation of.
Sources
- 《成唯識論》卷十，玄奘譯（大正藏 T1585） — CBETA：「此轉有漏八、七、六、五識相應品，如次而得」及大圓鏡智／平等性智／妙觀察智／成所作智四段相應心品定義；轉依「所轉捨」「所轉得」（accessed 4 Sep 2026）
- 通潤《成唯識論集解》卷十（卍續藏 X0821），明 — CBETA：「故曰：六七因中轉，五八果上圓」（accessed 4 Sep 2026）
- 憨山德清《八識規矩通說》（卍續藏 X0893），明 — CBETA：十二頌全文，含四段轉識頌（accessed 4 Sep 2026）
- 鄭紫薇〈六七因中轉，五八果上圓〉，佛門網明覺專稿，2020 年 10 月 9 日 — buddhistdoor.org：句出《成唯識論集解》卷十，及四智對應說明（accessed 4 Sep 2026）
- 釋道論〈「轉識成智」之理論與實踐〉，華嚴專宗學院研究所論文，2013 — huayencollege.org：轉識成智次第與果位圓成之說明（accessed 4 Sep 2026）
