Tokugawa Ietsugu died in 1716 without an heir. Yoshimune, lord of Kii since 1705, succeeded to the main Tokugawa house and became the eighth shogun. A collateral branch thus supplied a successor when the recent shoguns’ direct line ended.
Sorai’s Ken’en community gathered students with differing interests and abilities. Dazai Shundai became a prominent writer on government and economy, while Hattori Nankaku developed a distinguished literary career. Sorai’s educational thought valued the differences between people. Learning could find a use for varied capacities within a shared order. The school’s work included reading, interpretation, poetry and the practical preparation of texts, so teaching offered several paths through which a pupil could participate.
Sorai treated poetry as an expression of human disposition. Studying the Book of Songs, an ancient Chinese collection included among the Confucian classics, could enlarge understanding of people rather than merely provide examples for praise and blame. Hiraishi Naoaki places this literary dimension alongside Sorai’s institutional thought. The historian Bandō Yōsuke, in a dissertation summary, further interprets the school’s poems and discussions as ways of confronting feeling and frustrated political ambition within its account of community. That reading helps explain why a thinker concerned with government could also give literary expression substantial room.
The school’s intellectual life contained differences between Shundai and Nankaku, not a single program shared in every detail. Bandō also argues that Kamo no Mabuchi, a later scholar of Japanese classics, developed his criticism from close relations with questions already present among Sorai’s followers. Other references identify Sorai’s language method as an influence on Motoori Norinaga’s study of ancient Japanese writing. Receiving a method did not require accepting its entire political or Confucian purpose. The inheritance therefore spread through literary practice, rival interpretation and work in other bodies of texts.
Yoshimune changed the leadership around him. Manabe Akifusa and Arai Hakuseki, influential under the previous administration, lost their positions, while hereditary daimyo retained a central place in the governing council. He took charge of an existing bureaucracy with established offices, rather than creating a government from the beginning.
Before his formal appointment in the eighth month of the contemporary Japanese calendar, Yoshimune requested the Momijiyama library’s catalogue on the third day of the sixth month. The request documents an early use of the records and books inherited with the office. Succession brought both political authority and access to this collection, which he and scholars serving him would repeatedly consult during his rule.
Yoshimune’s Kyōhō government expanded from succession into fiscal, administrative and information-gathering measures. Ogyū Sorai received scholarly commissions and prepared political advice. His Seidan, generally dated around 1725–1727, diagnosed warriors’ dependence on urban cash expenditure and proposed stronger controls over residence, status and administration.
Sorai’s access did not make Seidan the shogunate’s adopted blueprint. The document records one ambitious response within a wider reform government whose policies emerged through officials, experiments and revision. Broadening the event beyond the accession connects Yoshimune’s new leadership to the governing work that made the succession consequential.
Tokugawa Yoshimune became eighth shogun in 1716. Sorai received an order in 1721 to add Japanese reading marks to Rikuyu Engi, a Chinese work explaining moral instructions. He also prepared Taiheisaku and later Seidan in connection with the ruler’s inquiries. Sources differ over proposed formal recruitment, but agree on commissioned work and political consultation. In 1727 Sorai was allowed an audience with Yoshimune. Learned access provided a setting for advice without itself establishing that a proposal had become government policy.
Seidan’s four volumes are generally dated around 1725–1727. Sorai described warriors concentrated in cities as occupying a condition of lodging: they depended on buying necessities rather than on a secure connection to local production. Cash expenses exposed serving households to prices and weakened the material basis of rank. He also criticized large population movements and conduct that, in his view, no longer followed properly defined status. The analysis connected livelihood and governing capacity, making inadequate institutions central to the problem as he understood it.
Sorai proposed planned placement of warriors in the countryside, rather than simply announcing a return to an earlier age. Registration would bind people to recognized home places; restrictions on movement and rules of consumption would sustain differences of status. He sought to reduce dependence on commercial provision by defining how groups should obtain and use resources. The promised stability came with coercive requirements. A household’s residence, movement and standard of living would become subjects of deliberate regulation within an order built to sustain warrior rule.
Sorai’s later writings included Rongochō, a commentary on the Analects, the collection of sayings and conversations attributed to Confucius. Gakusoku addressed learning, while his answers to questions recorded exchanges with others. He also studied military matters and Ming Chinese law with pupils. These fields required the interpretation of terms and practices as well as broader judgment about government. His output joined work for patrons, teaching texts, philosophical argument and practical inquiry, each with a different audience and use.
Sorai died in Edo in 1728 and was buried at Chōshō-ji in Mita, now part of Tokyo. His death did not complete the public circulation of his major books. Bendō, already revised and collated during his life, was published in 1737. Students and later editors therefore helped determine how subsequent readers encountered his thought. Continued transmission made a private teaching community consequential beyond the years in which its founder could lecture or answer questions.
Seidan followed another path. Its political contents were handled privately, and Bitō’s reference account describes Sorai’s stated intention to submit his handwritten text without showing it to pupils. Copies spread in the later eighteenth century, and a Kyoto edition appeared in 1868 after the shogunate’s fall. That history separates his immediate access to Yoshimune from the book’s later influence as a record of social conditions and reform thought. Sorai’s importance rests in the concrete work his learning made possible and in arguments that others could inherit, adapt or contest, rather than in the realization of one comprehensive plan.
During the 1710s in Edo, Sorai developed a gradually widening attack on received Confucian interpretation. He had studied the tradition associated with Zhu Xi, a twelfth-century Chinese thinker, and his Ken’en Zuihitsu of 1714 still criticized the Kyoto Confucian thinker Itō Jinsai from a position connected with that learning. By Bendō, drafted in 1717, he was advancing a more extensive criticism of both Zhu Xi and Jinsai. He argued that later readers could misunderstand ancient writings by giving their words meanings drawn from subsequent thought. Historical language study supplied the method for questioning those interpretations.
Bendō offers a general account of the Way, while Bemmei works through thirty-four major terms, including virtue, benevolence and wisdom. Both were written in Classical Chinese. For Sorai, the Way was embodied in institutions made by ancient sage rulers: rites, music, punishment and administration. These forms ordered relations and sought the security of the governed. Rites concerned organized conduct and rank; music also belonged to the shaping of a community. The claim directed attention toward what rulers instituted and how people could live within it.
