Confucius said: "Knowing is knowing, not knowing is not knowing, it is knowing." This means that whether you are a Confucian who has learned a lot about ancient and modern times, or a master who has studied both China and the West, there is no end to learning, and there must be some knowledge that you have not mastered. This requires us to be humble, eager to learn, and not ashamed to ask questions. Just like the geography teacher, he seeks truth from facts. If you don't know, you just don't know. Instead, he had the courage to recognize his own shortcomings and determined to study and verify from many sources. He finally made up for this shortcoming and brought his knowledge to a higher level. And this teacher's spirit of facing up to problems and having the courage to seek solutions is the necessary condition for the development of all knowledge.
