What is the story of Sima Guang peeling walnuts?

When Sima Guang was six years old, one day he and his sister were playing in his father's study. Playing, he took some walnuts out of his pocket, broke the hard shell and ate the walnuts inside. But just after chewing it a few times, I felt that the walnut kernel was bitter and astringent, so I spit it out. Sister said to him, "Look, there is a thin skin on the outside of walnut kernel. If you peel off this thin skin, it won't be bitter. " Sima Guang nodded and peeled it as my sister said, but it couldn't be peeled off. My sister helped me for a while and left without peeling it.

Just then, a maid came to pour boiling water. When she saw it, she told Sima Guang to put the walnut kernel in a teacup, pour boiling water on it and peel it for a while. Sure enough, walnuts are easy to peel.

After a while, Sima Guang's sister returned to the study. She saw white walnuts on the table and asked Sima Guang, "Who peeled this?" Sima Guang proudly said, "I peeled it!" This sentence fooled my sister, but I couldn't fool my father who was sitting at the window reading. Father was very angry when he heard that Sima Guang lied, so he went to Sima Guang and said to him sternly, "You obviously didn't peel this off. Why did you lie? " You are dishonest at such a young age. Will anyone believe you in the future? "

Sima Guang was criticized. Knowing that lying is a bad thing, he is determined to turn over a new leaf. After that, he never lied again. When he was old, he once had no money at home and found someone to sell a sick horse. He told the horse seller, "This is a sick horse. It will get sick in summer. If someone buys a horse, you should tell them honestly. " How thoroughly Sima Guang treated his mistakes!