Sun Jing of the Han Dynasty tied his hair to the beam with a rope to prevent him from falling asleep while reading. As long as he dozes off, he will be awakened. This is the story of "hanging beam with a thorn in the thigh" in history.
Che Yin, Sun Kang and Kuang Heng in the Jin Dynasty were so poor that they couldn't even afford to buy oil for lighting. In the summer night, Che Yin made a small pocket with gauze, caught some fireflies and put them in it, reading by the light of fireflies. Sun Kang sat in the snow on a cold winter night, studying hard through the reflection of snow; Kuang Heng cut a small hole in the wall and "stole" a little light from his neighbor's house to read. These are the stories told by the idiom "a firefly reflects snow" and "stealing light from the wall".
Wang Xizhi, a great calligrapher in the Eastern Jin Dynasty, studied calligraphy since childhood. Every time he finishes writing, he goes to the pond in front of his house to wash his brush. After a long time, a pool of clear water turned into a pool of ink. Later, people called this pond "Mo Chi". Through diligent study and practice, Wang Xizhi finally became a famous calligrapher and was called "the sage of books".