You have to recite the ancient prose and read the vernacular. It is impossible to read it once. It took me three times to understand the meaning of the Six Classics. I suggest you buy more books. For example, the Record of Treatise on Febrile Diseases in class and Hu Xishu's Lecture Notes on Treatise on Febrile Diseases. If you don't have the foundation of Chinese medicine, I suggest you start with it. Youku has a 70-episode video of Treatise on Febrile Diseases by Professor Hao Wanshan from Beijing Medical University. You should watch it, too