Because "The History of the Three Kingdoms" records that Zhuge Liang studied under Meng, Cui, Si Ma and so on. They all chewed their books slowly, but Zhuge Liang was the only one who read the book, that is, glanced at it roughly. Then during the discussion, Zhuge Liang said, you are only suitable for being an officer, and you are in an important position in a class of places, so that several other people can't grasp the overall situation. In other words, Zhuge Liang's ambition is far above the counties.