Coinage of Sōtō Zen founder Dōgen
The Japanese Buddhist word uji (有時), usually translated into English as Being-Time, is a key metaphysical idea of the Sōtō Zen founder Dōgen (1200–1253). His 1240 essay titled Uji, which is included as a fascicle in the Shōbōgenzō ("Treasury of the True Dharma Eye") collection, gives several explanations of uji, beginning with, "The so-called "sometimes" (uji) means: time (ji) itself already is none other than being(s) (u) are all none other than time (ji).". Scholars have interpreted uji "being-time" for over seven centuries. Early interpretations traditionally employed Buddhist terms and concepts, such as impermanence (Pali anicca, Japanese mujō 無常). Modern interpretations of uji are more diverse, for example, authors like Steven Heine and Joan Stambaugh compare Dōgen's concepts of temporality with the existentialist Martin Heidegger's 1927 Being and Time.