shikantaza, "just sitting", is the zen practice of sitting-meditation when done only for its own sake. "just sitting" with no purpose other than sitting, with no other ulterior motives attached to the deed itself. it is the same concept in jewish religion known as "l'shma". l'shma means the performance of the religious commandments only for their own sake, without regard or conscious consideration to any other divine providence that might accrue to the fulfillment of the sacramental duties. by performing a task in a disinterested fashion, with no other mental content attached to it other than the performance of the deed itself, one is able to reach ever higher levels of meditative mindfulness, and mindfulness, it is argued, is key to inner peace. as such, any action performed "just for its own sake" is recognized to be of great spiritual value and benefit to the practitioner. and therein lies the paradox. if indeed it is of great value and benefit to the practitioner to practice for its own sake, then it is no longer the case that the deed is done "just for" the sake of the deed itself.