The allusion to "Linchi" comes from Jin's four-body book. This allusion is related to Wang Xizhi, a calligrapher in the Eastern Jin Dynasty.
Wang Xizhi studied calligraphy since he was a child. He worships Zhang Zhi, a great calligrapher in the Eastern Han Dynasty. Whenever he has time, he ponders the shelf structure and momentum of fonts. He thought to himself that his fingers were scratched on the skirt, and even the skirt was cut after a long time. Because of this, later generations called them "book saints".
Zhang Zhiyou is good at cursive writing. His academic spirit is very rigorous. His handwriting is different from ordinary people. He writes repeatedly on clothes and silk at home. After writing, he dyed and cut clothes. He insists on writing by the pond every day. After a long time, the water in the pond turned black, so people called him "Cao Sheng".
Wang Xizhi is determined to catch up with Zhang Zhi. While traveling around the famous mountains and rivers of the motherland, he absorbed in studying the calligraphy of his predecessors and gradually formed his own unique style. After writing every day, he will go to the pond in front of his house to wash his pen and ink stone. Over time, the water in the pond turned black. People call this pond Mo Chi.
Later, people used this allusion to express their hardships. There is this person in Ceng Gong's Mo Chi Ji in the Song Dynasty: "The taste is longing for Zhang Zhi, learning books is close to the pool, and the pool is dark. This is a kind of help. Do you believe in evil? "