 Indian "dhyana" was translated as "chán" in Chinese, and "zen" in Japanese.Ideologically the Zen-tradition emphasizes prajna and sudden insight, but in the actual practice prajna and samādhi, or sudden insight and gradual cultivation, are paired to each other.Especially some lineages in the Rinzai school of Zen stress sudden insight, while the Sōtō school of Zen lays more emphasis on shikantaza, training awareness of the stream of thoughts, allowing them to arise and pass away without interference.