Northern Sòng Tiāntái master and prolific commentator, principal exponent of the Shānwài 山外 (“Off-Mountain”) wing of the Sòng-period Tiāntái Shānjiā / Shānwài 山家山外 doctrinal controversy. Sobriquets Wúwài 無外, Zhōngyōngzǐ 中庸子, Qiánfū 潛夫, and the residence-name Gūshān 孤山 (the Solitary Mountain monastery on the West Lake at Hángzhōu, where he spent his mature career). Posthumous title 法慧大師 Fǎhuì dàshī.
Born 976; died Qiánxīng 1 (1022) on the seventeenth day of the second month, age 47. The DILA Buddhist Studies Person Authority records his lifedates accordingly (A001282); brief biography in Fózǔ lìdài tōngzǎi j. 18.
He combined classical Tiāntái doctrinal scholarship with broad humanist learning, including Confucian and Daoist texts; his sobriquet Zhōngyōngzǐ signals his interest in Confucian ethical thought and his sobriquet Qiánfū alludes to the Eastern Hàn philosopher Wáng Fú. His prolific output covers commentaries on the standard Tiāntái canonical sūtras (Lotus, Great Concentration and Insight), on the Heart Sūtra (X529 = KR6c0148), on the Vimalakīrti, on the Foshuo banzhou sanmei jing and many others, as well as his collected literary writings (Xián Jūbiān 閑居編).
Doctrinally he led the Shānwài school’s reading of Tiāntái doctrine, emphasising the guānxīn 觀心 (mind-contemplation) interpretation of the yīniàn sānqiān 一念三千 doctrine and a moderately Mahāyāna-Yogācāra-leaning reading of xìngjù 性具 (inherent inclusion) — positions sharply opposed by the Shānjiā leader Sìmíng Zhīlǐ 四明知禮 (960–1028) in the most consequential intra-Buddhist doctrinal controversy of the Northern Sòng. The Shānjiā / Shānwài controversy occupies much of Zhìyuán’s mature output and shaped Sòng Tiāntái scholarship for a century.