Why did Lu Xun carve the word "early" on his desk?

Lu Xun is not only clever, but also diligent. When I was studying in San Tan Yin Yue, I was late for school once because I had to buy medicine for my sick father in the morning. The teacher criticized him and he regretted being late. In the corner of the table, he used a knife to engrave the word "early" to warn himself, and he has never been late since. Until his later years, Lu Xun remembered it clearly and told his relatives in a chat. This vividly shows Lu Xun's spirit of being strict with himself and studying hard since childhood.