Ink Writing by Wuzhun Shifan: A National Treasure of Zen Calligraphy at Tofuku-ji

Deep within the treasure repository of Tofuku-ji Temple in Kyoto lies one of the most historically significant documents in the world of Zen Buddhism: the ink writing (bokuseki) by Wuzhun Shifan, known formally as the Certificate of Enlightenment for Enni (Enni Inkajo). Written on silk in October of the Dingyou year — corresponding to the tenth month of the first year of the Jiaxi era (1237) — this calligraphic masterpiece represents a pivotal moment in the transmission of Zen Buddhism from China to Japan.

This National Treasure is far more than a beautiful piece of calligraphy. It is the very document through which the great Chinese Chan (Zen) master Wuzhun Shifan officially certified his Japanese disciple Enni Ben'en as his legitimate Dharma heir — a solemn act that would shape the course of Japanese religious and cultural history for centuries to come.

What Is an Inka Certificate?

In the Zen Buddhist tradition, an inka (印可) is a formal certificate of spiritual attainment issued by a master to a disciple. Unlike academic diplomas, an inka represents the master's acknowledgment that the student has achieved genuine enlightenment and is qualified to teach others. The word "inka" literally means "seal of approval," and receiving one was considered the highest honor a Zen practitioner could earn.

The practice of issuing inka certificates was central to the Chan/Zen tradition's emphasis on direct, mind-to-mind transmission of the Dharma from master to disciple. Each inka document is unique, written personally by the master, and serves as tangible proof that the lineage of Buddhist teaching remains unbroken. Wuzhun Shifan's certificate for Enni is one of the finest surviving examples of this tradition.

Wuzhun Shifan: The Great Chan Master

Wuzhun Shifan (1177–1249) was one of the most eminent Chan Buddhist monks of China's Southern Song dynasty. Born in Zitong, Sichuan province, he rose through the ranks of Chinese Buddhist institutions to become the thirty-fourth abbot of the prestigious Wanshou Temple on Mount Jingshan (Kinzan) — one of the most important Zen monasteries in all of China.

Wuzhun's reputation was so great that Emperor Lizong of the Song dynasty summoned him to court in 1233 to discuss Chan Buddhist doctrine. The emperor bestowed upon him the title "Fojian" (Mirror of the Buddha), along with a gold-embroidered kasaya robe — the very robe depicted in his famous portrait painting, also preserved at Tofuku-ji as a National Treasure.

Wuzhun was also renowned as a master calligrapher. His bold, powerful brushwork, influenced by the style of the celebrated calligrapher Zhang Jizhi, produced some of the finest examples of Zen calligraphy ever created. Three of his ink writings have been designated as National Treasures of Japan, including this inka certificate and the famous "Itawatashi no Bokuseki" (Calligraphy of the Board Gift) housed at the Tokyo National Museum.

Enni Ben'en: The Disciple Who Brought Zen to Kyoto

Enni Ben'en (1202–1280) was a Japanese monk from Suruga Province (present-day Shizuoka Prefecture) who traveled to China in 1235 to study under Wuzhun Shifan at Mount Jingshan. After just two years of intensive practice, Enni's spiritual achievement was recognized by his master, who presented him with this inka certificate in October 1237.

Enni returned to Japan in 1241, carrying with him not only the inka certificate but also his master's self-inscribed portrait, calligraphic plaques, and extensive knowledge of Chinese culture. He first established Joten-ji Temple in Hakata (present-day Fukuoka), then moved to Kyoto at the invitation of the powerful regent Kujo Michiie. There, he founded Tofuku-ji Temple — destined to become one of the great Zen temples of Kyoto and the fourth-ranked of the Kyoto Gozan (Five Great Zen Temples).

Enni's contributions extended beyond religion. He is credited with introducing techniques for making udon noodles and manju (steamed buns) to Japan, and his prayers in Hakata are said to have given rise to the famous Hakata Gion Yamakasa festival. The imperial court later honored him with the posthumous title "Shoichi Kokushi" (National Teacher Shoichi) — the first time such a title was granted to a Zen monk in Japan.

Why Was This Ink Writing Designated a National Treasure?

The inka certificate was designated a National Treasure of Japan on March 29, 1952, in the category of "Writings" (Shoseki). Several factors contribute to its extraordinary cultural significance.

First, this is an authentic, firsthand document of the direct transmission of Zen Buddhism from a leading Chinese master to his Japanese disciple. It represents a defining moment in the history of Japanese Zen, marking the formal establishment of Wuzhun Shifan's lineage in Japan through Enni Ben'en.

Second, the calligraphy itself is a masterwork of Zen brushwork. Written on silk — an unusual and luxurious choice that underscores the solemnity of the occasion — the certificate opens with the phrase "Dao wu nanbei" (The Way knows no North or South), a profound declaration that transcendent truth is universal, knowing no geographical boundaries. The brushstrokes are executed with what connoisseurs describe as a majestic, powerful quality characteristic of Wuzhun's calligraphic style.

Third, the document is invaluable as a historical artifact. Measuring approximately 53.9 cm by 102.7 cm, it bears Wuzhun Shifan's signature and vermilion seal, providing direct evidence of thirteenth-century Sino-Japanese cultural exchange at the highest levels of religious and intellectual life.

Highlights and Points of Interest

The inka certificate is rarely displayed to the public due to the delicate nature of the silk on which it is written. However, it has been exhibited at major museum exhibitions in recent years, including the landmark "Tofuku-ji" special exhibition at Tokyo National Museum (2023) and Kyoto National Museum (2023), the "Japan's National Treasures" exhibition at Kyoto National Museum (2017), and the "Zen: The Heart and Form" exhibition (2016).

When viewing the certificate, visitors should pay particular attention to the opening phrase "Dao wu nanbei" and Wuzhun Shifan's signature "Daisou Kinzan Mujun Rosou" (Old Monk Wuzhun of Mount Jingshan, Great Song) at the end. The vermilion square seal reading "Jun-mu" (the reversed characters of "Mujun") adds an additional layer of authenticity and visual beauty to the document.

The certificate is closely associated with other National Treasures at Tofuku-ji, including the full-length portrait of Wuzhun Shifan (painted in 1238, with Wuzhun's own inscription), and the nineteen calligraphic plaques for Zen temple signage that Wuzhun sent to Enni. Together, these artifacts form an unparalleled collection illustrating the personal bond between the Chinese master and his Japanese disciple.

Tofuku-ji Temple: Home of Zen Treasures

Tofuku-ji Temple, where the inka certificate is preserved, is itself one of the most important Zen temples in Japan. Founded in 1236 by regent Kujo Michiie and consecrated by Enni Ben'en, the temple takes its name from two great temples of Nara — Todai-ji and Kofuku-ji — reflecting its founder's ambition to create a monumental Zen institution.

The temple is home to an extraordinary collection of cultural properties, including five National Treasures and numerous Important Cultural Properties. Beyond its historical significance, Tofuku-ji is renowned for its spectacular autumn foliage, particularly the views from the Tsuten-kyo Bridge, and for the modern gardens designed by landscape architect Mirei Shigemori in 1939, featuring the iconic checkerboard moss garden at the Hojo.

While the inka certificate and other National Treasure calligraphic works are not on permanent display, the temple regularly participates in special exhibitions at national museums. Visitors to Tofuku-ji can experience the rich atmosphere of a major Zen monastery while walking the same grounds where Enni brought his master's teachings to life nearly eight centuries ago.

Nearby Attractions

A visit to Tofuku-ji can easily be combined with exploration of surrounding sites. Within the temple complex itself, there are twenty-five sub-temples, several of which offer special openings at various times of year. The Ryogin-an sub-temple, with its own National Treasure hojo (abbot's quarters), is especially noteworthy.

Nearby, visitors can explore Fushimi Inari Taisha, the famous shrine with thousands of vermilion torii gates, located just a short walk from Tofuku-ji Station. Senyu-ji Temple, the imperial temple of the Shingon sect, is also within walking distance. The Higashiyama district, home to Kiyomizu-dera, Sanjusangen-do, and the Kyoto National Museum, is easily accessible by bus or a pleasant walk along the eastern hills.