Itō Jinsai

Who They Were

Itō Jinsai (伊藤仁斎) was a Japanese Confucian philosopher, born August 30, 1627, in Kyoto, and died April 5, 1705, in Kyoto. He is considered one of the most influential Confucian scholars of seventeenth-century Japan and of the Tokugawa period (1603–1868) generally. His teachings flourished especially in Kyoto and the Kansai area through the final years of the Tokugawa shogunate.

Jinsai's school, known as the Kogigaku, criticized the teachings of Song dynasty Chinese philosopher Zhu Xi (朱熹, 1130–1200). Instead, Jinsai advocated a philosophical vision based on understanding the meanings of key terms in the Analects and the Mencius. His school has been considered part of a larger movement called Kogaku ("ancient learning"), which included earlier scholars such as Yamaga Sokō (山鹿素行, 1622–1685) and later thinkers such as Ogyū Sorai (荻生徂徠, 1666–1728).

However, Jinsai never mentions Sokō or his ideas, and Jinsai's own statements of philosophical meaning were strongly and systematically criticized by Sorai. Rather than as a thinker aligned with the so-called Kogaku movement, Jinsai's ideas are best understood on their own terms.

Life and Career

Jinsai was born in Kyoto in the fourth year of the Kan'ei era (寛永), under the reign of Emperor Go-Mizunoo. He spent his entire life in Kyoto, working as a Confucian scholar and philosopher. His primary place of work was the Kogidō, a school he established in the city.

He also went by the pen name Keisai. His family name was Itō, and he had several children who followed in his scholarly footsteps: Itō Kaitei, Itō Baiu, Itō Tōgai, Itō Rangū, and Itō Chikuri.

Jinsai's most notable work is the Dōjimon (童子問), a text written in question-and-answer form that lays out his philosophical positions. His other major work, the Gomō jigi (The Meanings of Philosophical Terms in the Analects and Mencius), is his opus and the work most frequently compared to that of later Chinese thinkers.

Why They Matter

Jinsai is widely known for his outspoken affirmation of the validity of human emotions. Where orthodox Zhu Xi Confucianism tended to treat desire and feeling as potential corruptions to be disciplined, Jinsai argued that human emotions were legitimate and integral to moral life. This position made him a distinctive voice in Tokugawa intellectual culture.

He also articulated a metaphysics highlighting the pervasiveness and infinite creative potential of a "unitary generative force" (Jpn: ichigenki, 一元気). This concept described a single, dynamic energy underlying all existence, constantly producing and renewing the world. For Jinsai, this force was not abstract but active and generative, and it grounded his positive view of human nature and emotion.

His method was to return to the original meanings of terms in the Analects and the Mencius, rather than relying on later commentaries. This approach placed him in tension with the dominant Zhu Xi orthodoxy of his day, and it made his work a model for later scholars who sought to recover the "ancient" meaning of Confucian texts.

The Name in Japanese

The name is 伊藤仁斎.

• Kana reading: いとう じんさい
• Romaji: Itō Jinsai

Character by character:

• 伊 (い, i): a character used mainly in proper names; in this word it functions as part of the family name Itō. It has no independent everyday meaning here, though it can refer to "that one" or appear in the word for Italy (伊, I).
• 藤 (とう, tō): "wisteria." This is a common element in Japanese surnames, often indicating a family's claimed descent from the Fujiwara clan (藤原, Fujiwara), whose name also begins with this character.
• 仁 (じん, jin): "benevolence" or "humaneness." This is one of the central virtues in Confucian thought, appearing prominently in the Analects. In Jinsai's name it signals his philosophical commitment to this virtue.
• 斎 (さい, sai): "purification" or "study room." In names, it often appears in scholarly or religious contexts, suggesting a place of disciplined learning or a person devoted to study. The character also carries the sense of fasting or ritual purification.

The full name thus reads roughly as "Itō, the benevolent scholar," with the given name Jinsai combining the Confucian virtue of jin with the studious connotation of sai.

Legacy

Jinsai's writings have frequently been compared to those of the Qing dynasty scholar Dai Zhen (戴震, 1724–1777). Dai Zhen's key work, Mengzi ziyi shuzheng (The Meanings of Philosophical Terms in the Mencius), is very similar in theme and method to Jinsai's Gomō jigi. Both works attempt to recover the original meaning of Confucian terms by examining their usage in the classical texts, and both reject later interpretive layers.

This comparison indicates Jinsai's renown in the larger world of East Asian philosophy. His influence extended beyond his own school and beyond Japan, as his method of textual analysis and his affirmation of human emotion resonated with later thinkers working in different political and cultural contexts.

Within Japan, his teachings continued to be influential in Kyoto and the Kansai region through the final years of the Tokugawa shogunate. His school, the Kogidō, remained a center of Confucian learning, and his children carried on his scholarly tradition. Even as later thinkers such as Ogyū Sorai criticized his specific philosophical conclusions, the terms of that criticism acknowledged Jinsai as a major figure whose positions had to be addressed.