Use the function of allusions to make the argument well founded.
Quote the words or things of predecessors to verify the author's theory. That is, the literary mind carves dragons, and the so-called "aiding the ancient to prove the present". Such as Li Shangyin's poem:
The middle way follows my strengths, and since ancient times, it has blocked both sides;
I advise you not to force the snake's foot, you can't taste the fragrant mash.
Among them, the word "snake foot" is quoted from the Warring States Policy: "There is a temple in the State of Chu, which gives wine to the other party, and the other party will say,' It is not enough for several people to drink, but one person can drink more. Please draw the land as a snake, and the first one will drink it. A snake came first. He took out the wine and drank it, holding it in his left hand and drawing a snake in his right hand, saying,' I can do it'. Before the matter was done, one person snaked, grabbed it and said,' There are not enough snakes, but Zi 'an is enough' and drank its wine. Shi Li used this as a citation and used it as the basis of his argument. (As a metaphor, don't make other complications)