Hōngzì yì 吽字義
The Meaning of the Letter Hūṃ (Unji-gi) by 空海 (撰)
About the work
The single-fascicle doctrinal-meditative exposition of the seed-syllable Hūṃ (吽), Kūkai’s detailed metaphysical-Esoteric analysis of a single letter — undertaken as a worked example of the foundational principles of Shōji jissō gi (KR6t0135). The work demonstrates in concentrated form Kūkai’s doctrinal-semiotic claim that a single Esoteric letter contains the entire dharma. It is one of the four foundational doctrinal treatises of the Shingon school.
Abstract
Authorship. Universally attributed to Kūkai under his Esoteric signature Henjō Kongō 遍照金剛.
Date. Conventionally 815–824 CE, contemporary with KR6t0135 Shēngzì shíxiàng yì and KR6t0128 Jíshēn chéngfó yì.
Structure. The work organizes itself in two principal sections:
- Exposition of the letter-form (解字相) — divided in four sub-sections, since the syllable Hūṃ analytically separates into four component syllables: hā (賀), ā (阿), ū (汚), and ṃ (anusvāra). Following the Vajraśekhara-sūtra exegesis, “this one letter contains four meanings.”
- Exposition of the letter-meaning (釋字義) — the doctrinal-philosophical content of the syllable.
Content. The letter Hūṃ is doctrinally analyzed as containing four meanings, corresponding to the four constituent syllables:
- Hā (賀) — the cause (因) — all dharmas are without cause. This is the doctrine of anutpāda (non-arising), which is the universal Esoteric doctrinal foundation.
- Ā (阿) — the fundamental unborn (本不生) — all dharmas are fundamentally unborn. The fundamental Letter-A doctrine of Mahāvairocana.
- Ū (汚) — the loss (損減) — all dharmas have neither increase nor decrease. The non-dimensional reality of phenomena.
- Ṃ (anusvāra) — the fierce (忿怒) — the wrathful-manifest power-aspect of Mahāvairocana.
Each meaning is given an extensive doctrinal-philosophical exposition with citations from the Mahāvairocana-sūtra, Vajraśekhara-sūtra, Bodhicitta-śāstra, and other foundational Esoteric texts.
Significance. The work is the canonical demonstration of Kūkai’s Shōji jissō gi program — that a single Esoteric letter, properly analyzed, contains the entire dharma. The choice of Hūṃ — the seed-syllable of the Wrathful Vidyā-rāja family and of the Vajradhātu mandala’s wrathful-deity manifestations — gives the work a distinctive dynamic-wrathful doctrinal voice, complementing the gentler Aji-kan tradition centred on Letter-A contemplation.
The work was extensively commented upon throughout the medieval and Edo Shingon tradition, and was studied alongside the Shōji jissō gi in the standard Shingon scholastic curriculum.
Translations and research
- Yoshito S. Hakeda (tr.), Kūkai: Major Works (Columbia, 1972) — full translation.
- Rolf W. Giebel (tr.), The Meaning of the Word Hūṃ — in Shingon Texts (BDK English Tripitaka, 2004), pp. 107–130.
- Ryūichi Abé, The Weaving of Mantra (Columbia, 1999).
- Yamasaki Taikō 山崎泰廣, Shingon: Japanese Esoteric Buddhism (Shambhala, 1988).