Advanced level. The book "Unity of Knowledge and Action" written by Du Yinshan is the best biography of Wang Yangming that can be bought in the market, and its writing style and ideological level are obviously higher than all similar books, so it is a high-level book. Du Yinshan is an expert in Yangming's psychology, a historical writer, a best-selling author, the founder and dean of Yangming Institute of Culture, and a visiting professor at Hunan Tianxia Institute.