Shikantaza, just sitting

The Soto school's founder Dogen Kigen (1200 to 1253), having studied under the Chinese Chan master Rujing, returned to Japan and wrote a short manual, commonly translated as the universal recommendation for zazen, that describes seated meditation without describing it as a method aimed at a further goal. The text instructs the practitioner to sit upright, breathe naturally, and let thoughts arise and pass without pursuing or suppressing them, calling this simply thinking of not thinking, a phrase meant to place the practice outside the ordinary opposition between having thoughts and being empty of them. Later Soto usage names this practice shikantaza, literally just sitting, to mark that nothing is added to the sitting itself, no koan to solve, no visualization to hold, no count of breaths to keep. Dogen's companion essay on pursuing the way, addressed to students soon after his return, makes the same point from a different angle: he writes that the zazen he teaches is not a step by step meditation technique among other techniques but the Dharma gate of ease and joy, already complete in itself. A student who is told to sit, and only to sit, is not being given a stripped down beginner's exercise; the sitting is presented in Dogen's own writing as the entire practice, with nothing behind it that the sitting is a preparation for.

Shikantaza is most easily located by what a Zen student following it does not do, and the clearest contrast on record is with the koan curriculum that the Rinzai teacher Hakuin systematized centuries after Dogen. Where a koan practitioner works a single assigned case, such as the sound of one hand, toward a moment of breakthrough a teacher then tests and confirms, a Soto shikantaza practitioner is instructed to hold no object and pursue no answer at all, since Dogen's own writing frames practice and realization as identical rather than as a path leading to a separate goal, a doctrine the tradition names shusho ichinyo. Historians of the two schools' formation, including Heinrich Dumoulin's history of Japanese Zen, describe the divergence as reaching back past both founders into differing readings of Chan practice in Song China, one favoring a gradual, object free settling into awareness and the other a concentrated, goal directed struggle with a single question. The two methods are not simply the same meditation dressed in different instructions; a Rinzai teacher measures a student's koan work against a defined checkpoint, while shikantaza has structurally no checkpoint to reach, only the ongoing act of sitting, part of why the two schools have kept separate training halls and separate teacher certifications for eight centuries rather than converging on shared technique.