Dōgen’s influence on Zen in Japan can be felt most immediately in the way he placed seated meditation at the very heart of the path. He taught *shikantaza*, “just sitting,” as a form of objectless meditation in which nothing is sought and nothing is manipulated, and in which zazen itself is understood as the full expression of awakening. This emphasis gave Sōtō Zen a distinctive orientation, different from approaches that foreground dramatic breakthroughs or intensive kōan work. In this vision, meditation is not a technique to get somewhere else; it is the embodiment of the awakened mind already present.

Flowing from this is Dōgen’s radical teaching on the unity of practice and enlightenment. Rather than seeing practice as a ladder leading up to some future attainment, he spoke of “practice–realization,” or the identity of practice and enlightenment, where each moment of sincere effort is itself the functioning of Buddha-nature. This perspective encourages a patient, methodical way of training, in which the ordinary rhythms of life are not obstacles but the very field of realization. Everyday activities, when undertaken with full awareness, become expressions of the Dharma rather than distractions from it.

Dōgen also reshaped the institutional and communal life of Zen. By founding Eiheiji as a rigorous training monastery and formulating detailed guidelines for conduct, ceremonies, work, and meditation, he created a model of disciplined communal practice that came to characterize Sōtō temples. His writings such as the *Shōbōgenzō* and other texts on monastic life provided both philosophical depth and practical instruction, stabilizing Sōtō Zen’s forms and making its teachings accessible in the Japanese language.

Over time, these elements—“just sitting” as the core practice, the identity of practice and enlightenment, the sacralizing of everyday activity, and a carefully structured monastic environment—gave Sōtō Zen a clear identity within Japanese Buddhism. Dōgen’s thought, especially his reflections on being, time, and Buddha-nature, offered a sophisticated framework through which practitioners could understand their own experience of the path. In this way, his legacy is not only institutional but deeply spiritual: a vision of Zen in which each moment, each action, and each breath can be lived as the complete manifestation of the Way.