In ancient China, there was a peasant’s son named Yu Heng. From an early age, he wanted to study. But he was poor and had no money to go to school. He enjoyed reading. Yu Heng could not afford to buy a book, so he had to borrow books to read. During those times, the books were very expensive, and those who had books refused to lend then to others easily. Yu Heng started working for rich people.
As a pay for his work, he asked them to give him books instead of money. He worked all day. It was only at noon that when he got a break from work, he had the time to read a book. So, a book often took around ten days to finish reading. Yu Heng was very worried, thinking that there was no time to read books during the day. He thought to read books at night.