Buddhism Zen Buddhism is divided into two main schools: Rinzai (臨済宗) and Sōtō (曹洞宗), the former greatly favouring the use in meditation on the koan (公案, a meditative riddle or puzzle) as a device for spiritual break-through, and the latter (while certainly employing koans) focusing more on "shikantaza" or "just sitting". Zen Buddhism is primarily found in Japan, with some presence in South Korea and Vietnam. The scholars of Japanese Soto Zen tradition in recent times have critiqued the mainstream Japanese Buddhism for "dhatu-vada", that is assuming things have substantiality, a view they assert to be non-Buddhist and "out of tune
Faith in Buddhism the focus on meditation practice which was common in Zen Buddhism, Dōgen led a revival of interest in the study of the "sūtras", which he taught would inspire to a faith based on understanding. Inspired by Chinese Chan Buddhism, Dōgen was attracted to a return of the simple life as exemplified by the Buddha in the "sūtras". He further believed that sitting meditation was not only the path to enlightenment, but also a way to the Buddha nature within. The practitioner should have the faith that the Buddha nature is already within, Dōgen taught, although Dōgen did not believe this