chronicles, and treatises—on music, ceremonies, calendars, religion, economics, and extended biographies. Sima's work influenced the writing style of other histories outside of China as well, such as the Goryeo (Korean) history the Samguk sagi. Sima adopted a new method in sorting out the historical data and a new approach to writing historical records. At the beginning of the Shiji, Sima declared himself a follower of Confucius's approach in the Analects to "hear much but leave to one side that which is doubtful, and speak with due caution concerning the remainder". Reflecting these rigorous analytic methods, Sima declared that he would not write about periods of history where there was insufficient documentation. As such, Sima wrote "the ages before the Ch'in dynasty are too far away and the material on them too scanty to permit a detailed account of them here". In the same way, Sima discounted accounts in the traditional records that were "ridiculous" such as the pretense that Prince Tan could via the use of magic make the clouds rain grain and horses grow horns. Sima constantly compared accounts found in the manuscripts with what he considered reliable sources like Confucian classics like the Book of Odes, Book of History, Book of Rites, Book of Music, Book of Changes and Spring and Autumn Annals. When Sima encountered a story that could not be cross-checked with the Confucian classics, he systemically compared the information with other documents. Sima mentioned at least 75 books he used for cross-checking. Furthermore, Sima often questioned people about historical events they had experienced. Sima mentioned after one of his trips across China that: "When I had occasion to pass through Feng and Beiyi I questioned the elderly people who were about the place, visited the old home of Xiao He, Cao Can, Fan Kuai and Xiahou Ying, and learned much about the early days. How different it was from the stories one hears!" Reflecting the traditional Chinese reverence for age, Sima stated that he preferred to interview the elderly as he believed that they were the most likely to supply him with correct and truthful information about what had happened in the past. During one of this trips, Sima mentioned that he was overcome with emotion when he saw the carriage of Confucius together with his clothes and various other personal items that had belonged to Confucius. Innovations and unique features Despite his very large