Dōgen stands in Buddhist history as the figure who firmly established Sōtō Zen as a distinct school in Japan, transmitting the Caodong/Sōtō lineage he had received in China and giving it enduring institutional form. By founding monasteries and shaping a disciplined communal life, he helped make Sōtō one of the major Zen traditions in Japan, alongside other Zen lineages. His emphasis on rigorous monastic discipline and careful observance of conduct contributed to a more structured and ethically serious style of Zen practice. In this way, his legacy is not only doctrinal but also institutional and practical, rooted in the everyday rhythms of monastic life.

At the heart of Dōgen’s significance lies his distinctive understanding of practice and enlightenment. He taught that practice and enlightenment are inseparable, that authentic practice is already the full expression of awakening rather than a mere means to a distant goal. This vision is embodied in his advocacy of *shikantaza*, “just sitting,” a form of zazen in which nothing is sought beyond the wholehearted act of sitting itself. Meditation, in this view, is not a technique to acquire enlightenment later, but the present manifestation of Buddha-nature. Such an outlook reshapes the spiritual path from a quest for attainment into a continuous enactment of what is already most deeply true.

Dōgen’s writings reveal a philosophical and spiritual depth that has made him one of Buddhism’s most influential thinkers. In his major work, *Shōbōgenzō* (“Treasury of the True Dharma Eye”), he offers subtle reflections on impermanence, time, and being, including the teaching often rendered as “being-time,” which portrays existence and temporality as inseparable. He reinterprets central doctrines such as Buddha-nature and karmic causality in ways that integrate rigorous practice with a refined metaphysical vision, presenting all phenomena as expressions of the Buddha-dharma. Composed in Japanese rather than only in classical Chinese, his texts also function as religious literature of great power, making sophisticated Buddhist thought more accessible while shaping the language and imagination of later Zen.

Taken together, these elements show Dōgen as both transmitter and innovator: a monastic reformer who insisted on strict discipline, a contemplative who elevated “just sitting” to the heart of the path, and a philosopher who articulated the unity of practice and enlightenment with unusual clarity. His thought and example continue to offer a model of a life in which meditation, ethical conduct, and insight are not separate stages but different facets of a single, ongoing realization.