Where is the saying that young people don't understand the essence and old people cry when they smell time and space?

It is based on Xin Qiji's "Ugly Slave Books in the Middle Wall of Boshan Road" in the Song Dynasty. The original text is that teenagers do not know the taste of sorrow and fall in love with the floor. Fall in love with the floor and worry about adding new words. Now that I know what it's like to worry, I want to talk about it. I want to say I'd better have a rest, but I said it's cold and autumn. It means that people don't know the taste of sadness when they are young, and they like to climb high and look far. In order to write new words, you must say that you are worried, not worried. Now I have tasted sadness, but I want to say it but I can't say it. I want to say, but I can't, but I say it's a cool autumn.

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This is a sentence written by Xin Qiji when he was impeached and left his post and lived in seclusion with the lake. During his stay by the lake, he wandered around Boshan Road, but he was not interested in enjoying the local scenery. Seeing more and more national affairs, I can't do anything about it, and I can't get rid of my worries. So I wrote this sentence on a wall of Boshan Road.

In the first film of the poem, the author emphatically recalled that he didn't know his own sorrows and sorrows when he was a teenager, so he liked to climb tall buildings and overlook the fence. When I was a teenager, I was young, inexperienced, optimistic and confident, and I still lacked real experience of the worries people often said. The first sentence is that teenagers don't know the taste of sorrow, which is the core of the last film. Xin Qiji grew up in the enemy-occupied area of Central Plains.

As a teenager, he not only experienced the sufferings of the people, but also witnessed the cruelty of the Jin people. At the same time, he was greatly encouraged by the heroic struggle spirit of the people in the north. He not only has the courage and talent to resist national rejuvenation, but also believes that the Central Plains can be recovered and the Jin invaders can be driven away. So, he doesn't know what sorrow is. In order to imitate previous writers and express a little so-called sadness, he fell in love with the floor and there was no sadness to be found.