What is Hakuin?
Hakuin Ekaku (白隠 慧鶴, 1686–1769) was a Japanese Zen master who revived the Rinzai school from a period of stagnation and built the graduated kōan curriculum that Rinzai monasteries still follow today. He composed the kōan What is the sound of one hand?, wrote the Zazen Wasan (Song of Zazen) still chanted in Japanese and Western dōjō, and left several thousand ink paintings and calligraphy pieces now held in museum collections across Japan.
Hakuin and Dōgen
Hakuin belongs to the Rinzai school; Dōgen (1200–1253) founded the Sōtō school. The practical difference is significant. Rinzai centres its training on kōan work: the practitioner works with a paradoxical question and presents answers in dokusan (private interview with the teacher). Sōtō centres on shikantaza, 'just sitting', with no kōan required. Both schools trace their origins to Tang-dynasty Chinese Chán, but they are distinct lineages with different methods. Hakuin is also sometimes confused with Linji Yixuan, the ninth-century Chinese master from whom the Rinzai name derives. Linji founded the original Chinese lineage; Hakuin reorganised and transmitted its Japanese branch twelve centuries later.
Life and reform
Hakuin was born in 1686 in Hara, a post-station on the Tōkaidō road at the foot of Fujisan in what is now Shizuoka prefecture. He entered a local Zen temple as a child and was ordained at fifteen. The autobiography he later wrote, Itsumadegusa (Wild Ivy), records his early disillusionment with rote temple life and a long itinerant pilgrimage through the rural Rinzai temples of central Japan in his early twenties. The decisive encounter came at age twenty-four, with Shōju Rōjin (Dōkyō Etan, 1642–1721). Shōju, a hermit teacher in the Iiyama hills, slapped Hakuin for offering a clever answer to the sound of one hand and put him through a brutal apprenticeship: sustained kōan work under conditions of hunger, exposure, and frequent verbal reproach. Hakuin reached his first decisive opening on Zhaozhou's Mu shortly after. That encounter set the lineage and the temperament of everything he later taught.
He spent the rest of his life rebuilding Shōin-ji, his modest home temple in Hara, into a major training centre. Daitoku-ji and Myōshin-ji both sought to recruit him; he declined and stayed. From Shōin-ji he trained over eighty senior heirs. Through those heirs almost the entire surviving Rinzai lineage of the modern era flows: Tōrei Enji, Suiō Genro, and through them the transmission to the Meiji-era teachers and beyond. He died at Shōin-ji in 1769, aged eighty-three.
The kōan curriculum
The Rinzai school Hakuin inherited had, in his estimation, largely lost the disciplined progression of kōan work that Song-dynasty Chinese Chán had developed. What remained was rote literary appreciation of the Mumonkan and Hekiganroku without sustained personal engagement. Hakuin reformed this. He sorted the cases into a graduated sequence: hosshin (dharmakāya) cases for the initial breakthrough; kikan (functional) cases for refining insight into responsiveness; gonsen (verbal investigation) cases on the ambiguities of dharma speech; nantō (hard-to-pass) cases for the most subtle attachments; and goi (the five ranks of Dongshan) cases for integration into ordinary life. He also composed original cases of his own. The best known is the sound of one hand (sekishu no onjō), designed as a breakthrough question for novices for whom Zhaozhou's Mu had grown too textually familiar. It is now the canonical first kōan in many Rinzai lineages. The curriculum Hakuin established is, with minor modification, what Rinzai monasteries and the modern Sanbō Kyōdan school still use. Adyashanti trained for fourteen years in a Maezumi-rōshi line that descends from Hakuin through Sanbō Kyōdan.
Art and the body
Hakuin treated sumi-e (ink painting) and shodō (calligraphy) as part of the teaching. His painted Bodhidharmas, calligraphic teaching scrolls, and rough self-portraits are held in museum collections across Japan. One famous scroll reads simply 坐禅, zazen. The brushwork is rough, knowing, and humorous; the figures carry the same presence on paper that the recorded sayings of the Chinese Chán masters carry on the page. He gave his pieces freely to lay students, visiting monks, and the country people who supported Shōin-ji. Several thousand pieces survive, and the catalogue is still being assembled.
He also wrote about the body as part of the practice. Yasen Kanna (Idle Talk on a Night Boat, 1757) is his account of a near-fatal Zen sickness in his early thirties. Sustained meditative exertion had produced symptoms he described as collapse, and he recovered through a breath-and-energy practice (naikan, inner gazing) learned from a hermit named Hakuyū in the hills above Kyoto. Western Zen teachers have long cited the text as a warning that high-intensity sitting without somatic awareness can break the practitioner. Norman Waddell's translations, Wild Ivy and The Essential Teachings of Zen Master Hakuin, are the standard English editions of his writings.