A fiery and intensely dynamic Zen teacher and artist, Hakuin (1685-1768) is credited with almost single-handedly revitalizing Japanese Zen after three hundred years of decline. As a teacher, he placed special emphasis on koan practice, inventing many new koans himself, including the famous "What is the sound of one hand clapping?" This English translation of Hakuin's intimate self-portrait includes reminiscences from his childhood, accounts of his Zen practice and enlightenment experiences, as well as practical advice for students.