This poem contains a simple dialectical view of contradiction transformation. It should be pointed out that there are certain conditions for the mutual transformation of contradictions. Without certain conditions, it is impossible to happen or realize transformation. This is the story of "A blessing in disguise is a blessing in disguise" in the poem. Sai Weng's horse was recovered, and it was a blessing to bring back a good horse; But later, my son broke his leg riding a horse, and the blessing turned into a curse. One of the sons went riding, either because he didn't take safety measures in advance, or because he was not good at riding, he fell off his horse. This is the condition for his blessing to turn into disaster. However, the statement that "the horse should be concerned about the country and the people" only talks about transformation, ignoring the conditions of transformation, which is one-sided and inappropriate. Of course, this is a poem, so it can't be said in that detail. Future generations can't be harsh on the ancients.