As a religion concerned with eternal salvation, Zen is based on and grew out of a Buddhist worldview very different from the currently prevalent scientific materialism. Indeed, says Taigen Dan Leighton, Zen cannot be fully understood outside of a worldview that sees reality itself as a vital, ephemeral agent of awareness and healing. In this book, Leighton explicates that worldview through the writings of the Zen master Eihei Dogen (1200-1253), considered the founder of the Japanese Soto Zen tradition, which is now spreading in many places in the West. Broader awareness of Dogen`s worldview and its implications, says Leighton, is helpful for a modern understanding of Zen and Mahayana praxis, and is relevant to contemporary environmental and ethical concerns.