"Four Books Ou Yi Jie" was written by Ou Yi Zhixu, one of the four eminent monks in the late Ming Dynasty and the ninth generation founder of the Pure Land Sect. Ou Yi was influenced by the Cheng-Zhu School since childhood, and later devoted himself to Buddhism and devoted himself to the integration of Confucianism and Buddhism. This book explains the Confucian classics "Four Books" with a Zen understanding, covering "The Analects of Confucius", "Great Learning Directly" and "The Doctrine of the Doctrine". Although "Mencius Choosing Breasts" has been lost, the remaining parts still integrate the Buddhist theory of mind and Confucian mind.
