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般若心經祕鍵開門訣

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Text ID
KR6c0201
Date
1097–1098
Dynasty
日本

Bānruò xīnjīng mìjiàn kāimén jué 般若心經祕鍵開門訣

Gate-Opening Resolutions on the Secret Key to the Heart Sūtra by 濟暹 Saisen (撰)

About the work

A three-juan late-Heian Esoteric sub-commentary on Kūkai’s Bānruò xīnjīng mìjiàn (KR6c0199, the Hannya shingyō hiken). Composed by the prolific Daigo-ji 醍醐寺 Ono-ryū 小野流 Shingon scholar 濟暹 Saisen (1025–1115). The text is precisely dated by its colophon: yúshí Chéngdé yuánnián shíèryuè xuángè bǐ yě 于時承徳元年十二月玄各比也 — the twelfth month of Chōtoku 1 = late 1097 / early 1098 CE, when Saisen was 72 (or 73 by traditional reckoning). Considerably more extensive than Kakuban’s later Hiken ryakuchū (KR6c0200), the Kaimon-ketsu is a three-fold-structured systematic commentary that takes the Hiken not only as the object of annotation but as the anchor of a comprehensive doctrinal exposition of the Esoteric reception of the Heart Sūtra. Preserved in Taishō Vol. 57, No. 2204.

Abstract

Author’s preface and self-positioning. Saisen opens with a striking metaphor: “a single color, a single fragrance — none does not fully fuse the principle of the universal Dharma-realm; the hundred grasses and hundred grains — all serve as medicine to expel the manifold diseases.” If even the most ordinary things contain the Dharma-realm, how much more does an abbreviated sūtra contain inexhaustible doctrine, and how much more does the Esoteric dhāraṇī contain unimpeded therapeutic power? The work is positioned as the labor of a mòyè zhī píndào (“a poor monk of the leaf-tip generation”): “I have barely tasted the residual flavor of the amṛta, yet I have not removed the famine of dharma-thirst; I have somewhat smelled the lingering fragrance of ghee, but my heart’s stupid sickness is not yet cured.” On the basis of this self-deprecating opening Saisen presents his sub-commentary as gate-opening resolutions — kāimén jué 開門訣 — that “open up the treasure-store” of Kūkai’s compressed Hiken.

Tripartite structure. The work is organized under three principal divisions:

  1. Dàwén dìyī: míng jiàoqǐ yīnyuán fēn 大文第一明教起因縁分 — “the great-text first part: clarifying the causes-and-conditions of the teaching’s arising”
  2. Dàwén dìèr: shì tímù fēn 大文第二釋題目分 — “the great-text second part: glossing the title”
  3. Dàwén dìsān: shì běnwén fēn 大文第三釋本文分 — “the great-text third part: glossing the body of the text”

The first division is itself sub-divided into the causes-and-conditions of the parent sūtra (the Heart Sūtra itself) and the causes-and-conditions of the present sub-commentary.

Parent-sūtra cause-and-conditions. Following the standard Esoteric formula, Saisen explains that all beings transmigrate in the two species of saṃsāric existence (fēnduàn 分段 and biànyì 變易) because of the two graspings of self and dharmas; “therefore the unsurpassed World-Honored One, the great compassionate father of the world, arises with unconditioned great compassion and the unimpeded power of expedient means, and to rescue such beings … preaches this profound Prajñāpāramitā sūtra of the formless-ultimate-essence.” The argument is then anchored in Lotus Sūtra passages on the buddhas’ single great purpose (kāi shì wù rù fózhījiàn 開示悟入佛知見) — Saisen integrates the Heart Sūtra’s Esoteric reception with the Lotus-school one-vehicle doctrine, an interesting synthetic move.

Sub-commentary cause-and-conditions. Saisen divides into zǒng (general) and bié (particular) causes. The general cause is the Vajra-summit’s exhortation that all Esoteric bodhisattvas should each expound the three-mystery gate (三密門) to extend the Esoteric teaching across the worlds. The particular cause is twofold: (a) Saisen’s personal vow (依自己本願) — quoting Kūkai’s own Sānjiào lùn 三教論 on the latter’s vow to spread the Esoteric Dharma — and (b) Saisen’s acceptance of his master’s command (依本師教命), which sub-divides into the cosmic dimension (Kūkai-as-Buddha’s-envoy) and the institutional dimension (Saisen’s specific Daigo-ji lineage-transmission obligation).

The remaining two divisions of the work — the title-exposition and the body-commentary — proceed phrase-by-phrase through Kūkai’s text in the kaimon-ketsu form, with each lemma followed by an extended doctrinal exposition that integrates Mahāvairocana-sūtra, Vajra-summit, Prajñāpāramitā-śāstra, and the broader Esoteric corpus. The result is the most extensive late-Heian sub-commentary on the Hiken, occupying three juan to Kakuban’s one-juan Ryakuchū.

Authorship and dating are secure: the colophon is unambiguous and the author signature is Saisen’s standard form. The Chōtoku era spans 1097–1099 CE; with the twelfth-month notation, the work is dated to late 1097 or early 1098 (depending on intercalary calculation).

Translations and research

  • Henny van der Veere, A Study into the Thought of Kōgyō Daishi Kakuban (Leiden, 2000) — touches on the late-Heian Hiken commentarial tradition including Saisen.
  • Ian Astley and the modern Shingon scholastic tradition: extensive Japanese-language literature on the Daigo-ji Ono-ryū commentaries; Saisen is one of the principal figures.
  • No substantial dedicated Western-language study located.

Other points of interest

The work is a key witness to the late-11th-century institutionalization of the Kūkai commentarial tradition in the Ono-ryū lineage of Daigo-ji. Its precise dating to Chōtoku 1 (1097/98) gives it a unique status as one of the best-dated Esoteric scholastic compositions of late-Heian Japan: most contemporary Shingon writings have to be dated only by author-lifespan. Saisen’s work is one of the principal pre-Kakuban sub-commentaries on the Hiken and predates Kakuban’s Ryakuchū (KR6c0200) by approximately a generation. The two sub-commentaries together — Saisen’s monumental three-juan Kaimon-ketsu and Kakuban’s compact one-juan Ryakuchū — represent the two principal scholastic models of late-Heian / early-medieval Esoteric sub-commentary: the kaimon-ketsu form (systematic re-structuring and expansion) versus the lüèzhù form (close phrase-by-phrase annotation).

The synthetic move of integrating Lotus-school one-vehicle doctrine into the Esoteric Heart-Sūtra exegesis is characteristic of the late-Heian period’s growing interest in Tendai-Shingon syntheses: Saisen here points toward the doctrinal-comparative interests that would flower in the next generation with Kakuban himself.

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