"Being the golden mean, thinking in words, being impartial, and the golden mean is not easy" means that Kong Ji wrote the book The Golden Mean, in which "the golden mean" means impartiality and "mediocrity" means invariability.
"Going to college is Ceng Zi" means that the book "University" was once written, and he put forward the idea of "self-cultivation, governing the country and leveling the world".
This passage comes from Wang Yinglin's Saint Amethyst in the Song Dynasty.
Extended data:
The Holy Amethyst is a traditional enlightenment textbook in China. Among China's ancient classics, Saint Amethyst is one of the most popular and understandable readers.
San Zi Jing is based on examples, including literature, history, philosophy, astronomy and geography, ethical justice, loyalty and filial piety. The core ideas of China's traditional culture include "benevolence, righteousness, honesty, respect and filial piety". While reciting The Amethyst, I learned common sense, Chinese studies and historical stories, as well as the truth of being a man and doing things in the story connotation.
Formally, three words are catchy. Because of its popularity, fluency and easy to remember, it is called the three traditional books in China together with Hundred Family Names and Thousand-character Works. Three-character classics, hundreds of surnames and thousand-character texts are also called the three enlightenment books of Chinese studies.
Saint Amethyst is a precious cultural heritage of the Chinese nation. Short, pithy and catchy, it has been a household name for thousands of years. Its content covers history, astronomy, geography, morality and some folklore. The so-called "familiar with the three-character classics, you can know the great events of the ages." Due to historical reasons, Saint Amethyst inevitably contains some spiritual dross and artistic defects, but its unique ideological value and cultural charm are still recognized by the world, and it has been regarded as a classic by the people of China for generations.
Reference source; Baidu Encyclopedia-Saint Amethyst