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In the Eastern Han Dynasty, there was a man named Sun Jing, a famous politician. When he was young, he was eager to learn. He often closed the door and kept reading alone. Reading from morning till night every day, often forgetting to eat and sleep. After studying for a long time, I am tired, but I still don't rest. After a long time, I was too tired to doze off. Afraid of affecting his study, he came up with a special method. In ancient times, men had long hair. He found a rope and tied it firmly to the beam. When he is tired of reading, he dozes off. When his head is lowered, the rope will hold his hair and hurt his scalp, wake up immediately and continue to study.

This is the story of Sun Jing's hanging beam.

During the Warring States Period, there was a man named Su Qin, who was also a famous politician. When I was young, because of the lack of knowledge, I went to many places to do things and was not taken seriously. After returning home, his family was also very cold and looked down on him. This is a great stimulus to him. So, he made up his mind to study hard. He often studies late into the night, is very tired, often takes a nap and wants to sleep. He also figured out a way to prepare an awl. Once he dozed off, he stabbed himself in the thigh with the awl. In this way, I suddenly felt pain, woke up by myself, and then insisted on reading. This made the story of Su Qin's "thorn".

Note: This idiom comes from the story of Sun Jing and Su Qin studying, and is used to describe the spirit of studying hard and studying hard. Their spirit of studying hard is good, but their methods of studying hard need not be imitated.