The independence of classics refers to the advance and lag of classic content relative to practical activities. Its advanced performance lies in the fact that some ancient books record the predictions or fantasies of human conquest of nature. Although the level of productivity at that time could not be achieved, it was confirmed by the later scientific development. There are also a lot of contents in ancient books that lag behind human practical activities, which are characterized by naive or wrong understanding of natural phenomena and the dross of feudal thought. Although these concepts and understandings have been proved to be fallacious by scientific development and social progress, as a historical record, these fallacies have been preserved together with the classics.
The dual essential characteristics of classic material and spirit show that classic is the unity of human thought knowledge and material carrier, and it is the product of people attaching systematic thought and knowledge to a certain form of material in the form of words.
Classics, as the crystallization of human thought and understanding, are of great significance to social progress.