I suggest that on the one hand, we should have a broad understanding of the concept of "human nature", on the other hand, we should have a profound understanding. It can also be said: make an all-round and three-dimensional understanding of human nature. Please note: this sentence contains a self-evident meaning, that is, are there some educational theories that have nothing to do with the comprehensiveness of human nature and have no three-dimensional grasp of human nature? It can also remind us that when we encounter any educational theory in the future, we must ask: Has it ever thought about human nature? Does it involve the richness and profundity of human nature? Or just see one aspect of human nature, one level? If its positioning is only partial, that level is only a very low level, how can it be presented to the world? How can we believe this theory and teach it to children? To put it bluntly, there are many famous educators who often use prejudice and vulgarity to exert the truth of education and hinder human life. This problem is very serious. So, don't talk about education. Before talking about education, we should have a comprehensive understanding of human nature.