The difference between content and meaning. Instinct theory is a philosophical theory that human behavior and thinking are driven by instinct, not free will. The new explanation of instinct theory is based on the research of modern biology and psychology, and puts forward a more scientific and concrete explanation. The content and meaning of the two are different. Based on the teaching records of Guo Shengbai, a master and great doctor, and the clinical and health care practice of Dean Guo Dacheng, A New Interpretation of Instinct expounds Lao Guo and his direct descendant Guo Dacheng's understanding of traditional Chinese medicine.