Hakuin Zenji (1689-1769) is a towering figure in Japanese Zen. A fiery and dynamic teacher and renowned artist, he reformed the Zen Rinzai tradition, which had fallen into stagnation and decline in his time, revitalizing it and ensuring its survival even to our own day Hakuin emphasized the importance of zazen, or sitting meditation, and is also known for his skillful use of koans as a means to insight: the most famous of all koans, "What is the sound of one hand clapping?" is attributed to Hakuin. This is the first English translation of Hakuin's intimate self-portrait. It includes reminiscences from his childhood, accounts of his Zen practice and enlightenment experiences, as well as practical advice for students.