Indeed the fact that Dōgen styled his effort "Shōbō genzō" suggests that he had as his model a similar compilation of the same title by the most famous of Sung masters, Ta-Hui Tsung-kao (Zonggao ). Unlike the latter, Dōgen was content here simply to record the stories without interjecting his own remarks. A few years later, however, he embarked on a major project to develop extended commentaries on many of these and other passages from the Ch'an literature. The fruit of this project was his masterpiece--the remarkable collection of essays known as the kana, or "vernacular", Shōbō genzō.