Speaking of Cao Cao's allusions, when Li Li advised Guo Si to play, he was once out of danger. However, after Li and Guo joined forces, they continued to hunt down Emperor Xian of Han Dynasty. Someone recommended Cao Cao, saying that he had made great contributions in suppressing the Qingzhou Yellow Scarf Army and could be rescued. However, when the messenger didn't go out, the allies killed him. Seeing that there was no way out, Xia Houdun was ordered by Cao Cao to "protect" the army and succeeded. After that, Li and Guo were defeated, and Cao Cao was appointed as an official. Therefore, there is a saying called "Speak of the devil and he will arrive". The folk saying is that Cao Cao took the initiative to escort, which is slightly different from the Romance of the Three Kingdoms. See "Romance of the Three Kingdoms" for the fourteenth time, "Move to Xu Department". Besides, Cao Cao crusaded against Dongdan. He was the prefect of Dongjun. At this time, the yellow turban insurrectionary appeared in Shandong. He and Bao Xin, the prime minister of northern Hebei Province, fought against the Yellow Scarf Uprising, with more than 300,000 troops. From then on, Cao Cao became more and more famous, and was named the general of Town East by the court. After Dong Cheng and Yang Feng arrived in Luoyang, they were still worried about the attack of Cui Li and Guo Si, so they invited Xian Di and announced that Cao Cao had entered the DPRK to assist the royal family. After receiving the order, Cao Cao set out in Shandong and came to Luoyang to escort him. Just outside Luoyang, Cui Li and Du Ji came to attack Luoyang. People often have this experience, sometimes talking about someone or just thinking of someone, this person appears. So, we sighed: It's really "speaking of the devil". Psychologists explain that it is easy for people to forget the prediction of a hundred failures, but they relish an accidental success. There is a saying similar to "Speak of the devil" that "injured fingers often touch". Why does a person always have the idea that injured fingers are often touched? There is a simple reason. Actually, it's just that we pay special attention to the injured finger. In other words, our perception of the outside world is selective. From this, we can understand why "speaking of the devil". Because that's the truth: we remember what exactly fits this experience, but we forget what doesn't. It's not how accurate our predictions are, but the choices we make are more conducive to confirming this sentence. In fact, on various occasions, it is rarely accurate to predict. It's just that people tend to forget the predictions of a hundred failures, but they relish an accidental success. It should be said that quite a few coincidences can be explained by this.