This idiom comes from The Analects of Confucius and Gongye Chang. It is sensitive and eager to learn, and is not ashamed to ask questions. -I believe you have studied this paper.
The plot goes like this:
On one occasion, Confucius went to the Luwang Ancestral Temple to attend the ancestor worship ceremony. He asks people about almost everything from time to time. Someone laughed at him behind his back, saying that he was rude and asked everything. After hearing these comments, Confucius said, "Ask if you don't understand, that's exactly what I want to know."
At that time, there was a doctor in Weiguo named Kong Kui, who was open-minded, eager to learn and upright. At that time, there was a custom in society, that is, after the death of the supreme ruler or other people with status, they were given a title called Shi. According to this custom, after his death, Kong Cong was canonized as "Wen", so people later called him Zi.
Confucius' student Zi Gong was unconvinced. He thought that Confucius also had shortcomings, so he asked Confucius, "Teacher, why can Zi be called Wen?"
Confucius is "sensitive and eager to learn, and is not ashamed to ask questions, so he is called' Wen'." It means that Kong Cong is smart and diligent, and he is not ashamed to study with people whose positions are lower than himself and whose knowledge is worse than himself, so he can use the word "Wen" as posthumous title.