Dōgen’s Zen is marked above all by the radical centrality of shikantaza, “just sitting.” Where other Zen lineages often favored kōan study or structured techniques, Dōgen presented simple, objectless sitting as the very heart of the path. This sitting is not a preparatory exercise or a method to induce a special state; it is the full manifestation of awakening itself. In this light, zazen is not a ladder to some higher realm but the direct expression of Buddha-activity in the present moment.

From this flows Dōgen’s distinctive teaching on the unity of practice and enlightenment, often expressed as shushō-ittō. Many Buddhist systems describe a progression from delusion to a final attainment, but Dōgen undermines this linear model. Practice does not produce enlightenment as an effect; rather, genuine practice is already enlightenment in action. Each moment of wholehearted zazen is complete, not a fragment on the way to completion. The old debate over sudden versus gradual awakening is thus sidestepped by emphasizing continuous practice-enlightenment.

Dōgen’s understanding of Buddha-nature also sets his vision apart. While affirming the Mahāyāna view that all beings possess Buddha-nature, he stresses its universal and pervasive presence, extending even to what is usually called inanimate. Buddha-nature is not treated as a hidden essence to be uncovered later, but as the living reality that practice reveals and enacts here and now. This perspective encourages a profound reverence for the entire field of existence, where nothing is outside the scope of the Dharma.

This non-dual vision permeates his treatment of everyday life. Rather than reserving awakening for special meditative states, Dōgen presents eating, cleaning, working, and all ordinary activities as sites where Buddha-nature is expressed. The distinction between sacred and mundane loses its force when each action, performed with full attention, is understood as complete practice. In this way, the monastery kitchen or the simple act of walking can embody the same depth as formal meditation.

Underlying these emphases is a strong insistence on the non-duality of subject and object, self and other, and even time and being. Reality is not divided into a profane world here and a transcendent nirvāṇa elsewhere; when seen correctly, this very life is the field of liberation. Dōgen’s teaching thus reshapes inherited doctrines into a vision where each moment of sincere practice is already the life of the Buddha, and where nothing need be sought outside the activity of this present mind and body.