What is the content of the post on the balcony? What is the general meaning expressed?

The mountains are high and the rivers are long, and there are millions of objects. Without an old pen, it would be poor to be young and strong. On the 18th, I went to the balcony to read, Taibai. ""Tie on the Balcony" was written by Li Bai when he, Du Fu, and Gao Shi visited the Balcony Palace in Wangwushan. Li Bai was looking for Sima Chengzhen. When he arrived at the balcony, he learned that Sima Chengzhen had passed away and had no chance to see him again. He didn't see him, but After seeing his paintings, I wrote "Up to the Balcony" after seeing his paintings. In the minds of today's people, Li Bai is a great poet who will shine forever. However, in the Tang Dynasty when the poet lived, his poetry was definitely not as famous as it is today, but he was still famous. There is one identity: Li Bai not only wrote a large number of Taoist poems, but also received Taoism.

"Shangyang Tie" is written by Li Bai, a poet and calligrapher of the Tang Dynasty. "Tie on the Upper Balcony" is a four-character poem written by Li Bai himself, a work of cursive calligraphy written in ink on paper created in 744, which is now collected in the Palace Museum in Beijing. The author also expresses his admiration for Sima Chengzhen by praising his works. The whole volume is vigorous and elegant. Such as Li Bai's bold and elegant poetic style. The whole post is also full of ups and downs, looking forward and sentimental, and endlessly interesting.

"Shangyang Tie" is a four-character poem written by Li Bai, and it is the only one handed down from generation to generation. The original calligraphy is also a "national treasure" among the first-class cultural relics of the country, known as "First-Class A".