Integration of the Perfect and Esoteric teachings Saichō played a pivotal role in shaping the doctrinal and institutional framework of
Japanese Buddhism, especially through his synthesis of the teachings of the Chinese
Tiantai school and
Chinese Esoteric Buddhism. This integration led to the establishment of a distinct form of Japanese Tendai that incorporated Esoteric practices (Taimitsu) while maintaining the central focus on the
Lotus Sutra and the teachings of
Zhiyi. Saichō's synthetic teaching came to be called
"enmitsuzenkai": the union of the Perfect (En, i.e. Tiantai teachings), Esoteric (Mitsu), Meditation (Zen), and Precepts (Kai). In Japan, Saichō’s teachings diverged from the approaches of earlier Nara Buddhism, which largely adhered to exoteric doctrines. Saichō’s core innovation was his belief in the unity of the
Lotus Sutra and Esoteric Buddhism, encapsulated in the term
enmitsu itchi (円密一致), or "the identity of the meaning of Perfect and Esoteric teachings." This system integrates the study and practice of key Mahayana practices based on Zhiyi's
Mohe Zhiguan (Jp:
Makashikan), including
shikan (
śamatha-vipaśyanā) meditation, Lotus Repentance rites, the
Four Samadhis and
the Threefold Contemplation along with a parallel study track focusing on
Mikkyō (esoteric practices like
mantra and
deity yoga). It is for this reason that the formal Tendai educational curriculum came to include two tracks which were studied by ordinands: • Shikan-gō (止觀業): Focuses on Mahayana practices taught in Zhiyi's
Mohezhiguan, and related texts. • Shana-gō (遮那業): Focuses on esoteric practices based on the
Mahāvairocana-sūtra, and other esoteric scriptures. Saichō, in his
Kanjō Tendai-shū Nenbun Gakushō-shiki (Regulations for Tendai School Annual Ordinands), emphasized the practice of the
Four Samādhis (四種三昧,
shishu zanmai), as described in Zhiyi's
Mohe Zhiguan. He sought to establish a
Four Samādhis Hall as a place for this practice. Saichō argued that both the
Lotus Sutra, which emphasizes universal salvation, and Esoteric Buddhism, with its focus on secret practices for enlightenment, ultimately pointed to the same spiritual truth. This stance distinguished Saichō from other Buddhist schools of the time, including the
Shingon school, which prioritized Esoteric practice as superior to exoteric sutras. But the
Vairocana school (
shanashu 遮那宗) and Tendai interfuse with one another. They also share the same commentary.... There should be no such thing as preferring one to the other. The
Lotus and the
Golden Light are those texts to which the previous emperor
Kanmu] devoted himself, and there exists no difference between the One Unifying Vehicle [of Tendai] and Shingon.For Saichō, the practices of Esoteric Buddhism did not replace the teachings of the
Lotus Sutra but complemented them, providing a direct means (jikidō) to attain Buddhahood in this very life (
sokushin-jōbutsu). This direct path contrasted with the more gradual approaches found in the Nara Buddhist schools, which Saichō believed took eons to lead to enlightenment. In the early years of the 9th century, Saichō returned to Japan and began to establish the Tendai school on Mount Hiei. He founded a new ordination system that allowed for the reception of the
Bodhisattva precepts, which permitted one to become a bhikkhu, or monk, within the framework of the Mahāyāna tradition. This marked the formation of the Japanese "Mahāyāna ordination platform" (
dai jō kaidan), which was distinct from the Vinaya traditions of the Nara schools. However, Saichō faced significant challenges. During his years of study, many of his early disciples left Mount Hiei, either defecting to the Hosso school or studying Esoteric Buddhism with Kūkai. Despite these challenges, Saichō continued to promote the integration of Esoteric practices within the Tendai system. He envisioned the practice of both exoteric (Lotus Sutra) and esoteric teachings as fundamental to the path of enlightenment. Yet, over time, Saichō began to realize that his vision of
enmitsu itchi was not fully shared by Kūkai, particularly regarding the esoteric precepts and the nature of transmission. Tokuitsu, while acknowledging universal Buddhahood, supported the theory of the five natures (or lineages), which posits that some beings (especially the
icchantikas) lack the capacity to manifest buddha-nature through practice due to their "
gotra" (lineage), a key theory found in Yogacara treatises. Saichō criticized this position as containing elements of
Hinayana and asserted that all beings can attain Buddhahood as taught in the
Lotus Sutra. He further rejected the common Buddhist view that only exceptional beings like
Shakyamuni could attain Buddhahood through their heroic bodhisattva practices and instead emphasized that "those who believe in the Buddha-nature of all beings, engage in altruistic practices, and advance on the path to Buddhahood are true
Bodhisattvas". Saichō's understanding of Buddha-nature also reflects influences from
Huayan Buddhism, particularly the thought of
Fazang and possibly Saichō's first Japanese teacher Gyōhyō 行表 (722–797). Huayan doctrine had begun to be influential on continental Tiantai during this time (as can be seen in Saichō's teacher
Daosui). Saichō had also studied Huayan in Japan before his trip to China. Central to Saichō's view is the belief that suchness, as a universal reality, possesses both a static and a dynamic aspect (as taught in the
Awakening of Faith and in Fazang's commentary). Saichō linked the dynamic expression of suchness, referred to as "active buddha-nature" (
gyō-busshō), to the phenomenal world. This view emphasizes that all beings have the potential to realize Buddhahood, a perspective that integrates Tiantai notions of non-dual mutual inclusion with Huayan ideas of nature-origination (which sees buddha-nature as a basis for all reality). Saichō's emphasis on the universality of suchness allowed him to extend the concept of Buddha-nature beyond all sentient beings to include the entire phenomenal world. Lopez and Stone describe Saichō's Huayan (J. Kegon) influenced view of Buddha-nature as follows: Saichō, the Japanese Tendai founder, countered in part by drawing on Huayan (J.
Kegon) thinkers to argue that suchness has not only a quiescent aspect as universal principle (fuhen shinnyo), but also a dynamic aspect that manifests itself as the concrete forms of the phenomenal world (zuien shinnyo). He also maintained that suchness has the nature of realizing and knowing. Thus, there was no need to postulate seeds in the store consciousness of only certain individuals as the cause of buddhahood. Saichō equated suchness in its dynamic aspect with active buddha nature, and because suchness is universal, everyone has the potential to realize buddhahood. By integrating these insights, Saichō developed a unique perspective on Buddha-nature that elevated the empirical world as a vital sphere of enlightenment, in which, as the Huayan sutra states, “countless realms preach the dharma. The land preaches the dharma. And living beings preach the dharma.” The
Brahma Net Sutra provided a set of ten major and forty-eight minor bodhisattva precepts, which Saichō adopted as the basis for ordination. However, the
Lotus Sutra also played a crucial role in shaping Tendai views on the precepts. While the
Lotus Sutra does not explicitly outline precepts in the form of rules, its teachings were interpreted by Tendai monks to support a wide range of positions on monastic discipline, from strict adherence to the vinaya to the complete transcendence of formal precepts. Saichō’s reforms laid the groundwork for the development of the “Perfect-Sudden Precepts” (endonkai), a concept that became central to Tendai
monasticism. These precepts were understood as being rooted in the
Lotus Sutra and were seen as encompassing both the form and spirit of Mahāyāna practice. The Perfect-Sudden Precepts were not merely a set of rules but were interpreted as expressions of the inherent
Buddha-nature within all beings. This view allowed for a more flexible approach to monastic discipline, emphasizing the intention behind actions rather than strict adherence to formal precepts. One of Saichō’s most significant achievements was his successful petition to establish a Mahāyāna precept platform (kaidan) on Mount Hiei. This platform was intended to serve as the site for conferring the bodhisattva precepts on Tendai monks, thereby creating a distinct ordination lineage. The establishment of the platform was a direct challenge to the
Nara schools, which controlled the traditional vinaya ordination platforms. Despite strong opposition, Saichō’s efforts were posthumously approved by the imperial court in 822, and the platform was constructed in 827. The Mahāyāna precept platform marked a turning point in Japanese Buddhism, as it allowed for the ordination of monks solely based on bodhisattva precepts. This innovation not only solidified the Tendai school's identity as an independent tradition, but also set a precedent for later Japanese Buddhist schools, including Zen and Pure Land, which eventually adopted similar ordination practices. Saichō’s new model of monastic ordination had a profound and lasting impact on Japanese Buddhism as a whole. His model became the normative standard for Buddhist ordination in many schools of Japanese Buddhism that developed out of Tendai, including
Jōdo-shū,
Rinzai and
Sōtō Zen. Over time, the bodhisattva precepts were adapted and reinterpreted, leading to a more flexible approach to monastic discipline that allowed for the integration of lay practitioners and the eventual acceptance of married clergy. Even the schools which promoted the keeping of Vinaya precepts, like the
Risshū school, or the schools which did not make use of bodhisattva precepts at all, like
Jōdo Shinshū, cited Saichō's writings on the precepts, if only to defend themselves and explain why they did not agree with it. == Works ==