Idioms about things you know.

Review the past and learn the new? 【wēn güzhüxīn】？

Commentary: text: review; So: old. Review old knowledge and gain new knowledge and experience. It also refers to recalling the past to better understand the present.

From: The Analects of Confucius in the Warring States Period: "Reviewing the past and learning new things can be a teacher."

Read the classics extensively, review what you have learned, and then gain new insights from them. Only at this level can you be called a teacher.

Extended data

First, learn new synonyms from old friends.

How many times do you know? [sh incarnation Wenger lai]?

Interpretation: Numbers: calculation; Go: the past; Come: the future. Knowing the past can infer the future.

Said by: Yi Shuo Gua by Zhou Wenwang in the Western Zhou Dynasty: "Those who count the past are smooth, and those who know the future are reverse."

Calculate the past and predict the future.

Second, learn new antonyms by reviewing old friends.

Forget your ancestors after several times? [sh ǔ Dion z ǔ]?

Interpretation: number: number, say; Canon: refers to the historical system and deeds. When talking about the historical system and deeds, I forgot the responsibilities of my ancestors. Metaphor is forgetfulness. It also means ignorance of one's own history.

Said by Zuo Qiuming in the Spring and Autumn Period, "Zuo Zhao was a special official for fifteen years": "Father has no future! I have forgotten my ancestors. "

His father has no descendants! Counting past deeds will forget ancestors.