Yugong wanted to move mountains, not because of a sudden enthusiasm, but after careful consideration. First of all, his purpose of moving mountains is very clear. "The traffic jam in Beishan is difficult to get in and out of," which shows that he suffered from traffic jams. During the whole process of moving the mountain, Yu Gong stood tall and saw far, considered the problem very carefully, and refuted Zhisou with reasonable grounds. Who can believe that such a respectable old man is a "stupid old man"?

Zhisou is a smart old man. He despises Yu Gong and opposes moving mountains. At the beginning, he was plausible and taught others a lesson, but then he was rendered speechless and embarrassed. This is exactly what a smart person deserves. A wise old man is short-sighted, retreats when faced with difficulties, does nothing and talks freely, trying to be a teacher. Such people think they are righteous, but in fact they are just showing off their cleverness.