Hongzhi Zhengjue (Chinese: 宏智正覺; pinyin: Hóngzhì Zhēngjué; Wade–Giles: Hung-chih Cheng-chueh, Japanese: Wanshi Shōgaku), also sometimes called Tiantong Zhengjue (Chinese: 天童正覺; pinyin: Tiāntóng Zhēngjué; Japanese: Tendō Shōgaku) (1091–1157), was an influential Chinese Chan Buddhist monk who authored or compiled several influential texts. Hongzhi's conception of silent illumination is of particular importance to the Chinese Caodong Chan and Japanese Sōtō Zen schools. Hongzhi was also the author of the Book of Equanimity, an important collection of kōans. Source: Wikipedia (en)