According to the "Guangyun" (Tang Yun), the pronunciation is achieved by combining "ku" and "ye". According to the "Yun Hui", the pronunciation is achieved by combining "qi" and "xie", with the same pronunciation as "qie". The "Shuowen Jiezi" explains it as "joyful and unhindered". "Ying Shao Shuo" means "contentment of the heart". The "Book of Han, Annals of Emperor Wen" records: "The common people of the world have not yet had their wishes fulfilled." Additionally, according to the "Jiyun" and "Leipian", the pronunciation is achieved by combining "jie" and "ye", with the same pronunciation as "jia". The meaning is the same. The character is derived from the "heart" radical (xin), and "gu" indicates the pronunciation. It is also written as "qie".