Early-Táng 唐 Daoist master, foundational figure of the Chóngxuán 重玄 (“Double Mystery”) school — the Táng philosophical-soteriological tradition that synthesised Daoist cosmology with Mādhyamika Buddhist dialectic. Zì Zǐ shí 子實; Buddhist-Daoist religious title Xī huá fǎ shī 西華法師 (“Dharma Master of Western Florescence”). Fl. c. 631–655 CE.
Lifedates. No precise dates recorded. Active career attested in the Zhēn guān 貞觀 (627–649) and Yǒng huī 永徽 (650–655) eras — under Táng Tàizōng 太宗 and early Gāozōng 高宗.
Origins. Native of Shǎn zhōu 陝州 (Hénán) or possibly Mǐn zhōu 閩州. The textual tradition is not entirely consistent.
Religious career. Served under imperial Daoist patronage. In 631, by imperial decree (Tàizōng chì 太宗敕), he was summoned to the capital Cháng’ān 長安 and installed at the Xī huá guān 西華觀 — hence his title Xī huá fǎ shī. He participated in the formal Buddhist-Daoist philosophical debates of the early Táng court, representing the Daoist side. Later exiled (reasons uncertain) during the middle of Tàizōng’s reign.
Works. His principal surviving works are two massive commentaries on the foundational Daoist classics:
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[[KR5c0139|Nán huá zhēn jīng zhù shū]] 南華真經註疏 (DZ 745) — the subcommentary (shū 疏) to Guō Xiàng’s 郭象 (郭象) Zhuāngzǐ commentary. Preserved integrally in the Daozang. The primary document of his thought.
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Dàodé jīng kāi tí xù jué yì shū 道德經開題序訣義疏 — his Dàodé jīng commentary. Previously thought lost; substantial portions recovered through:
Philosophical system. Chéng Xuányīng articulates the mature Chóngxuán doctrine:
- The Dao is neither yǒu 有 (being) nor wú 無 (non-being). (fēi yǒu fēi wú 非有非無.)
- Yet the Dao is both yǒu and wú merged into one.
- Mystery upon mystery, rejection upon rejection (xuán zhī yòu xuán, qì zhī yòu qì 玄之又玄，棄之又棄) — the characteristic dialectical doubling that gave the school its name.
- Total forgetfulness (jiān wàng 兼忘) as soteriological goal — absolute interior silence that transcends both negation and affirmation.
- Non-attachment to non-attachment — even the rejection of opposites must itself be relinquished.
These formulations are Mādhyamika-derived (cf. Mūlamadhyamakakārikā) but applied within a distinctively Daoist framework, with Lǎozǐ’s 道 and wú wéi 無為 as anchor-terms.
Lineage. Chéng Xuányīng worked alongside and was sometimes conflated with his contemporary 李榮 Lǐ Róng (fl. 658–663) — the two being the principal early-Táng Chóngxuán masters. Their shared philosophical vocabulary and their joint participation in the Buddhist-Daoist court debates of the Táng made them the de facto founders of the mature Chóngxuán tradition.
Influence. Chéng Xuányīng’s Chóngxuán formulations shaped:
- Subsequent Táng Daoist thought — including Sīmǎ Chéngzhēn 司馬承禎 (646–735) and Xuánzōng’s imperial commentary (KR5c0059).
- Sòng Lǎozǐ commentary — Chóngxuán language pervades the Sòng commentarial tradition (Lǚ Huìqīng, Huīzōng, Shào Ruòyú, Dǒng Sījìng).
- Chán Buddhism — the Chán tradition’s gōng àn 公案 paradoxes parallel Chóngxuán doublings.
Dating. Active c. 631–655. No precise lifedates. No CBDB record (Táng-era religious figure). No DILA authority identification (he is a Daoist, not Buddhist).