A masterful philological study on a famous letter sent by the Chinese Buddhist master Fa Zang (643-712) to his Korean colleague Uisang. This work focuses on the ideological implications of the letter in the context of seventh-century Hwa Yen Buddhism. This book is part of a series by the Italian School of East Asian Studies (ISEAS) research institute, which focuses on the history, culture, literature, and religion of East Asia. Unless otherwise noted, all books are primarily in English, with references in Chinese and Japanese for important terms, concepts and bibliographical sources throughout.