 On the other hand, the Sōtō school, of which Dōgen (1200–54) is the founder, does not rely on an elaborate kōan system to learn to become a Zen person, but instead follows a method called “just sitting” (shikan taza). It refers to a single-minded, diligent practice where the qualifying term “just” means the practice of meditation without any intervention of ego-logical interest, concern, or desire, so that the practice remains undefiled. This is a method of meditation predicated on the belief that the Zen practitioner engages in the practice in the midst of the original enlightenment. Or to characterize it by using Dōgen’s phrase, it is a method of “practice-realization.” By hyphenating practice and realization, the following implications are suggested: meditation is not a means to an end, i.e., a means to realization, and thereby Dōgen closes a dualistic gap, for example, between potentiality and actuality, between before and after. Accordingly, he collapses the distinction between “acquired enlightenment” (shikaku) and “original enlightenment,” (hongaku) where the “acquired” enlightenment means an enlightenment that is realized through the practice of meditation as a means. With this collapsing, the Sōtō School holds that practice and realization are non-dual in relation to each other; they are “not two.”