Dōgen’s Shōbōgenzō stands out within the Sōtō tradition as a work of striking originality, both in content and in form. Rather than offering a tidy doctrinal system, it unfolds as a series of independent yet deeply interrelated fascicles that probe fundamental Buddhist themes such as buddha-nature, time, and practice-realization. The text resists being reduced to a manual of doctrine; its reflections on “being-time” and the unity of practice and enlightenment remain deliberately open-ended, more like an ongoing inquiry than a settled position. Later Sōtō writings and commentaries tend to stabilize these explorations, turning Dōgen’s fluid insights into more clearly defined doctrinal points and practical guidelines suited to institutional and pedagogical needs.

A central distinguishing feature is the uncompromising emphasis on the non-duality of practice and enlightenment (shushō-ittō). In Shōbōgenzō, zazen—especially shikantaza, “just sitting”—is presented as the immediate and complete expression of awakening, not a step on the way to some future attainment. This stance undercuts any simple means–end model of spiritual progress. Subsequent Sōtō literature, shaped by training regimens and temple structures, often reintroduces graded practice, moral discipline, and standardized forms, thereby softening the radical immediacy that characterizes Dōgen’s presentation.

The language of Shōbōgenzō further marks it as distinctive. Dōgen writes in a highly poetic and rhetorically dense style, blending vernacular Japanese with classical Chinese expressions, and making extensive use of wordplay, paradox, and innovative terminology such as “genjōkōan” and “uji.” This linguistic creativity is not ornamental; it functions as a method of pointing directly to lived experience and disrupting habitual conceptual patterns. Later Sōtō texts and commentaries, by contrast, generally favor clearer, more didactic prose that seeks to explain, systematize, and sometimes simplify what Dōgen leaves provocatively multivalent.

Another important difference lies in the way scriptural sources and kōans are handled. In Shōbōgenzō, Dōgen does not merely repeat inherited interpretations; he re-reads and reconfigures traditional materials in ways that challenge conventional understandings of buddha-nature and realization. His treatments often refuse to settle into a single, authoritative “solution,” instead inviting practitioners into the very activity of questioning. Later exegesis tends to treat these readings as fixed authorities to be accepted and transmitted, rather than as models for further creative engagement, and thus shifts the living, exploratory character of Shōbōgenzō into a more stable doctrinal legacy.