Sermon of One Hundred Days is the first translation into English from Korean of a seminal text in Korean Buddhism. Buddhism was introduced into Korea through China in about the 4th-5th century C.E. and within 200 years became so advanced that it influenced the development of Chinese Buddhism. Chan Buddhism was introduced into Korea around the 8th century and Seon Master Jinul (1158-1210) is honoured as having set the curriculum for the education of Buddhist monks and established Korean Buddhism as it was known for the next millennium. In this Sermon of One Hundred Days, published in 1967,...