Are there any short stories in history about learning self-confidence?

(I) Mao Sui's Self-Recommendation

During the Warring States period, Qin's army besieged Handan, the capital of Zhao. Zhao sent Prince Ping Yuan to Chu to ask for help. Prince Ping Yuan's disciple, Xing Sui, was so confident that he recommended himself and asked to go there, and as a result, he finally persuaded the king of Chu to agree to help Zhao. As a result, he finally persuaded the king of Chu to agree to help Zhao. Later, people used the idiom of "Mao Sui's Self-Recommendation" to describe a person's self-referral and self-recommendation. This story also reflects that Mao Sui was a man of confidence.

(2) Yanzi's mission to Chu

During the Spring and Autumn Period, Qi and Chu were both big states. Once, the king of Qi sent Yanzi, a great doctor, to Chu, and the king of Chu, relying on the strength of his own country, wanted to take the opportunity to humiliate Yanzi and show Chu's power. The king of Chu knew that Yan Zi is short in stature, so he asked people to open a five-foot-high hole next to the city gate. When Yan Zi came to Chu, the king of Chu asked the people to close the city gate and let Yan Zi go through this hole. Yan Zi looked at it and said to the receptionist, "This is a dog hole, not a city gate. Only when you visit a 'dog country' do you go in through a dog hole. I'll wait here for a while, you guys go and ask what kind of country is Chu?" The receptionist immediately passed Yanzi's words to the king of Chu. The king of Chu had to order the gates of the city to be opened wide to welcome Yanzi in.

(3) Jingwei reclaims the sea

After Yan Di's daughter drowned in the East China Sea, her soul was transformed into a small bird named Jingwei. Although Jingwei was small, he was confident in the face of the vastness of the sea, and often bridged the wood and stones of the western mountains to fill the East China Sea, vowing to fill the East China Sea.