This article is on Mou Zongsan's judgment about the doctrines of Confucianism and Buddhism, revolving around his autobiography. "Autobiography at Fifty" is a description of the development of his life as well as an introduction about the living entity of philosophy, considering Confucianism, Taoism, Buddhism and Christianity as the knowledge of life, among which Buddhism is discussed the most. Although it is an autobiography at the age of fifty, some doctrines of Mou's philosophy developed later in his life can be found in this book. This is not an easy book, but those who have experience in the fulfillment of life can understand it more easily. Mou's philosophical thinking is quite comprehensive, delving into Chinese, western and Indian philosophies along with even the issues of states and nations. In this article, the writer only describes and reflects on his judgment about Confucianism and Buddhism in the fifth and sixth chapters of his autobiography to show how Mou understood the knowledge of life and what philosophical life he embodied, and also introduces the philosopher's wisdom accumulated from his rich living experience.