What is the story of Sima Guang breaking a water tank with a stone to save his little friend?

The whole sentence means: only when the water comes out can the child live. The original text of an article "Breaking an urn to save a friend" in the Song Dynasty's Biography of Sima Guang is as follows:

Sima Guang was born at the age of seven, and he stood in awe as an adult. As soon as he heard about Zuo's Spring and Autumn Annals, he loved it endlessly and retired for his family, which was his great purpose. Naturally, I can't put down my books. I don't know if I'm hungry or thirsty. A group of children were playing in court. One climbed the urn and his foot fell into the water, so everyone abandoned it. As long as the urn is broken with a stone, the water will burst and the child will live. Later in Beijing, Luo painted a picture.

Translation:

When Sima Guang was seven years old, he looked as serious as an adult. He listened to Zuo's Spring and Autumn Annals and enjoyed it very much. When he got back, he asked his family to tell him about it and immediately understood the general situation. From then on, I didn't put down my books, and I didn't even know I was hungry, thirsty, cold and hot.

A group of people are playing in the yard. A child stood on the jar and fell in. Everyone left him. Sima Guang picked up a stone and smashed the jar. The water poured out and the drowning child was saved. Later, in the Northern Song Dynasty, Kaifeng Luoyang (circulated) used pictures (Sima Guang smashed the jar).

Extended data:

Sima Guang, whose real name is strategist, was born in Sushui Village, Xia County, Shaanxi Province (now Xia County, Shanxi Province) in the Northern Song Dynasty, and was known as Mr. Sushui in the world.

Sima Guang was born in November of the third year of Tianxi in Song Zhenzong (A.D. 10 19). At that time, his father Sima Chi was serving as the magistrate of Guangshan County in Gwangju, so he was named "Guang". Sima Guang's family has been an official for generations, and his father Sima Chi later became an official to the Ministry of War, a doctor and a celestial pavilion, and has always enjoyed a high reputation for being honest and kind.

When Sima Guang was seven years old, he was as sensible as an adult. When he heard the teacher explain Chunqiu, he liked it very much. After school, he told his family what he had learned, so he also understood the connotation of Chunqiu. I have never left this book, even forgot hunger, thirst and cold, and devoted myself to it.