This article includes five essays. "Wise Men Know how to Protect Themselves well". It means being able to see through the crisis at any time, escape from danger, and save one's life; not let ancestors and descendants be ashamed, and find the opportunity to "die in a proper place". 80% of the behaviors that are repeated in life, use more thought and research whether there is a better way to improve them. Self-cultivation means improving one's body, mind and spirit; making the body strong and handsome, the mind strong and kind, and the spirituality pure and elegant. Farmers are suffering, there are many suffering people in the world, please heart-to-heart and have mercy on farmers! And understands my father and my sons.