Kuiji (窺基, कुयिजी - Kuyijī; ཁུའེ་ཅི། khu'e ci Khueji, universally revered across China, Korea, and Japan as Ci'en Dashi - 慈恩大師, Great Master of Ci'en), acclaimed throughout East Asian Buddhist history as the foremost Chinese disciple of Xuanzang (602–664) and the true doctrinal founder and systematizer of the East Asian Yogacara (Faxiang / Weishi) school, stands as one of the most brilliant 7th century scholastics, logicians, and commentators in the Chinese Tripitaka. With his year of birth in 632 and his year of death in 682, Kuiji was born into a prestigious aristocratic military family in Chang'an (modern Xi'an) in Shaanxi province, China, as Yuchi Hongdao, the son of General Yuchi Zong and nephew of the legendary Tang dynasty military commander Yuchi Gong. Possessing towering physical stature, photographic memory, and piercing intellectual acuity from early youth, he was spotted on the streets of Chang'an by Xuanzang, who recognized him as the reincarnation of an ancient Himalayan meditator and persuaded his family to allow young Kuiji to practice fearless renunciation, take formal refuge in the Buddha, the Dharma, and the Sangha, and enter the monastic order at age seventeen.
Receiving full monastic ordination in the Dharmaguptaka Vinaya Pitaka lineage while upholding strict monastic precepts and ethical conduct, Kuiji entered Xuanzang's imperial translation bureau at Hongfu Monastery and the Great Ci'en Monastery in Chang'an around 648–656. Under Xuanzang's personal, exclusive tutelage, Kuiji mastered Sanskrit grammar, the complete exoteric Tripitaka, Abhidharma, Madhyamaka dialectics, the epistemological logic (Hetuvidya) of Dignaga and Shankarasvamin, and the profound consciousness-only phenomenology inherited by Xuanzang from the venerable Nalanda Abbot Silabhadra (529–645). Assisting Xuanzang as chief scribe and editor in rendering dozens of monumental Sanskrit scriptures into Chinese, Kuiji absorbed the esoteric oral explanations of Indian Yogacara commentarial lineages directly from his master.
Kuiji's defining literary and philosophical breakthrough occurred in 659 during the compilation of the Cheng Weishi Lun (成唯識論, Discourse on the Perfection of Consciousness-Only, Taisho Number 1585), when Xuanzang initially planned to translate all ten Indian commentaries on Vasubandhu's Trimshika (Thirty Verses, Toh Number 4055 in the Tibetan Tripitaka) separately. Recognizing that contrasting Indian interpretations would bewilder East Asian readers, Kuiji persuaded Xuanzang to synthesize all ten commentaries into a single, cohesive treatise centered upon Dharmapala's authoritative exegesis, with Kuiji serving as sole amanuensis and subsequently composing the monumental twenty-fascicle commentary Cheng Weishi Lun Shuji (成唯識論述記, Taisho Number 1830), which established the doctrinal orthodoxy of the Faxiang school.
Prolific to a degree that earned him the reverent title Master of a Hundred Commentaries (Baiben Shuzhu), Kuiji composed over forty surviving masterworks preserved in the Chinese Tripitaka spanning Yogacara, Prajnaparamita, Lotus Sutra exegesis, Abhidharma, and Indian logic. Among his most celebrated treatises are the Dasheng Fayuan Yilin Zhang (大乘法苑義林章, Forest of Meanings in the Dharma Garden of the Great Vehicle, Taisho Number 1861), an encyclopedic doctrinal summa of Faxiang philosophy; the Yinming Ruzhengli Lun Shu (因明入正理論疏, Taisho Number 1840), the definitive East Asian commentary on Shankarasvamin's Nyayapravesha (Taisho Number 1630 and Toh Number 4208) that standardized Buddhist syllogistic logic across China, Korea, and Japan; the Miaofa Lianhua Jing Xuanzan (Taisho Number 1723) on the Lotus Sutra (Taisho Number 262 and Toh Number 113); and the Bore Boluomiduo Xinjing Youzan (Taisho Number 1710) on the Prajnaparamitahrdaya Sutra (Heart Sutra, Taisho Number 251 and Toh Number 21).
Philosophically, Kuiji systematically codified the intricate architecture of Faxiang Yogacara, elucidating the Eight Consciousnesses (ashtavijnana), the Three Natures (trisvabhava), the Four Portions of Cognition, and the Five Categories of Spiritual Potential (panchagotra). Demonstrating how deluded subject-object duality arises through dependent co-arising from karmic seeds stored within the storehouse consciousness (alayavijnana), Kuiji articulated the five-stage contemplative path (wowei weishi) through which practitioners transform the eight defiled consciousnesses into the four non-conceptual enlightened wisdoms (jnanas) of a Buddha.
Harmonizing Asanga and Vasubandhu's consciousness-only phenomenology with Nagarjuna's teachings on emptiness (शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid) and dependent origination, Kuiji showed how piercing right view and non-attachment dismantle grasping at both external material objects and internal ego-hood, dissolving attachment to the five aggregates, anatta, emptiness of self, karma, and rebirth. Anchoring subtle scholastic analysis in Shakyamuni Buddha's foundational teachings on the Four Noble Truths, the Noble Eightfold Path, anicca, and dukkha across the six realms, he guided practitioners to uproot the three poisons of greed, hatred, and delusion through meditation, mindfulness, and single-pointed concentration.
Following Xuanzang's passing in 664, Kuiji assumed leadership of the Great Ci'en Monastery in Chang'an and traveled across northern China—including Mount Wutai—preaching the Dharma, training hundreds of Chinese, Korean, and Japanese disciples, and cultivating generosity, merit, loving-kindness, compassion, equanimity, skillful means, and universal bodhicitta.
Passing into final parinirvana at the Great Ci'en Monastery in Chang'an in 682 at the age of fifty amidst deep veneration from the imperial court and the entire Chinese Sangha, Kuiji was enshrined in a stupa beside his master Xuanzang at Xingjiao Monastery near Chang'an. Carried forward in China by Huizhao (650–714) and Zhizhou (668–723), in Korea by Woncheuk and Daeheung, and in Japan as the foundational patriarch of the Hosso school at Nara, Kuiji stands forever alongside Asanga, Vasubandhu, Dharmapala, Silabhadra, and Xuanzang as a supreme guardian of the Middle Way and full awakening.