Ask if you don't know, and you won't learn. It means to consult others humbly if you don't understand, and to study deeply if you don't understand. Educate students to ask questions if they don't understand, and form a good habit of being diligent and asking questions.

The original text is as follows:

If you don't know, ask. If you don't learn, you won't be virtuous. If you didn't see it, it would be ridiculous; See it without knowing it, although it is true; If you know what you are doing, you will be trapped.

-Xun Kuang, thinker and educator during the Warring States Period.

Xunzi (about 325-238 BC) was honored as "Qing", so he was also called. Sun Qing was renamed in the Han Dynasty, a native of Zhao State (now southern Shaanxi) at the end of the Warring States Period, and a famous thinker in the pre-Qin period.

Xunzi traveled to Qi in his early years and learned a lot. He served as the "wine sacrifice" of the Xia Ji of the State of Qi for three times. In about 264 BC, at the invitation of him, he went west to the State of Qin. After that, he returned to Zhao, where he joined Cheng Xiao in front of Linwu Junyi. Later, Xunzi was used by Chu Chunshen as the order of Lanling (now Lanling Town, Cangshui County, Shandong Province). Engaged in teaching and writing in his later years.

Xunzi is knowledgeable, inherits and develops Confucianism and absorbs the strengths of various schools, so he is unique in Confucianism. On the issue of human nature, Xunzi advocated the theory of evil nature, and good nature was the result of enlightenment. In the view of heaven, he put forward the view that "those who master fate and make use of it" will conquer heaven. Xunzi attached great importance to ceremony, and advocated the Confucian thought of kingship, believing that "water can carry a boat and also overturn it".