Vernacular Confucius said, "Do I really have knowledge? No I don't. An ignorant man came to ask me, and I knew nothing about what he asked. According to his question, I asked him from both positive and negative aspects to inspire him. After I understand and master it clearly, I will tell him everything I know. "

What Confucius said here is "knocking at both ends is exhausted", which vividly embodies his tireless teaching spirit and good teaching methods inspired and induced. The reason for "knocking at both ends" is to achieve the purpose of "exhaustion", that is, "exhaustion". Although the questioner is stupid, you should not ignore him. Tell him what you know. As Zhu said, "Confucius said modestly that he had no knowledge, but he told people that although he was stupid, he didn't dare to stop listening." Knock on the door and start. Two ends, or two ends. Words begin at the end, end at the end, top down, thin and thick, and do everything. "

"Knock at both ends and exhaust" is an important way of thinking, and it is also the embodiment of his golden mean thought of "grasping at both ends and using at both ends". Everything has two sides, beginning, background, up and down, fine and coarse, good and bad. Only by "knocking at both ends" and asking, exploring and understanding things from two aspects can we avoid one-sidedness and gain a comprehensive understanding of things. Only by "grasping at both ends and using at both ends" can we avoid going to extremes, correctly grasp things and properly solve problems.