Go to town with a pole, go to town with a pole.

Lu has a long pole to enter the city gate. At first, he held it vertically, but he couldn't get in horizontally, and he couldn't get in. He can't figure anything out. An old man in Russia said, "I'm not a saint, but I've seen a lot!" Why not use a saw? So I cut it off.

Selected from Kobayashi (Three Kingdoms Wei Dynasty) "The Man Who Walks into the City Gate with a Long Pole": inflexible, unable to think, flexible and changeable.

Old man: Be smart and be a teacher.

This story illustrates four moral points:

1. Some things are not insoluble, but not so perfect.

Sometimes, a seemingly unsolvable problem can actually be solved by divide and conquer, that is, turning a big problem into a small one. The old father's method is uneven segmentation in today's language.

Although this is a joke, this joke tells people a truth: thinking should be flexible and not one-sided and stubborn.

People who think they are smart are stupid.