This book is twenty-one life education lessons written for the public by medical staff from Zhongshan Hospital Affiliated to Fudan University in Shanghai. Based on the personal experiences of more than 20 doctors from Zhongshan Hospital, the book describes how we should view diseases and changes, how to adjust our attitudes and moods, and how to always maintain enthusiasm and hope for life when facing major challenges in life. The book lists a total of 21 "life keywords", including awe, faith, persistence, rationality, love, etc., Interprets the value and meaning of life from multiple dimensions, and tells the personal experiences of doctors in the critical care department, respiratory department, cardiology department, and operating room. It is a very vivid life education book.