Studies of classical literature seldom take a holistic view of the creative groups of writers. A survey of all countries shows that those who can be called ‘masters’ are all those who have made great achievements in a particular field. Through interaction with the external reality with their eyes, people have gained rich experience and formed many specific visual concepts, which serve as the basis for a variety of metaphorical mappings and expressions. In English, “clear” means that things are obvious and easy to be seen, while “bright” and “brilliant”mainly refer to light or colour shining strongly. “Clear” means that people have good eyesight and can see things with ease. Only when people see things clearly, can they say that they understand them. Thus, “clear” is used to express the meaning “to understand.” Evidently, “clear” refers to people's sharp and clear understanding of certain things in these expressions. In addition to understanding, “clear” also has the metaphorical meaning that things manifest or exhibit themselves clearly or obviously so that they become easy for people to understand.