The evaluation of their love is reflected in "Song of Everlasting Regret".
"Song of Everlasting Sorrow" mainly describes the love story between Tang Taizong (Li Shimin) and Yang Guifei (Yang Yuhuan). This story was fictionalized by Bai Juyi based on folklore. "Song of Everlasting Sorrow" was composed in the first year of Yuanhe. According to Chen Hong's "Song of Everlasting Regret", Bai Juyi's original intention in writing "Song of Everlasting Regret" was to "punish the beauty, stifle the chaos, and hang down the future", which can be said to have an "allegorical" meaning. Moreover, in the poem "Mrs. Li" in "Xin Yuefu", it is specifically mentioned that "Emperor Wu of the Han Dynasty is not the only one who is sad. He has been so sad since ancient times and today. I don't see you... Tailing burst into tears, Mawei slope down to remember Concubine Yang, even if The beauty turns to dust, and this hatred lasts until it is unsold." This is also a footnote to the subjective intention of creating "Song of Everlasting Sorrow". Therefore, "Song of Everlasting Sorrow", from the time when Concubine Yang entered the palace to the Anshi Rebellion, satirizes the monarch's lust for the country and the concubine's special favor. However, this intention was not carried through to the end. When Bai Juyi described the love tragedy of Yang and Li, he also held a sympathetic attitude and used many touching plots and language to make the tragedy sentimental and pathos. In this way, the phenomenon of dual themes entangled with each other appeared. In particular, the mythical repeated rendering of Xuanzong and the imperial concubine's life-and-death love and haunting dreams in the poem greatly dilutes the former theme. For example, the poem writes about Xuanzong's sadness at the scene after the death of Concubine Yang:
The water of Shujiang River is green and the mountains of Shu are green, and the Holy Master is in love with her day and night. Seeing the moon in the palace looks sad, and hearing the sound of broken bells in the rainy night.
After this paragraph, he continued to write about Xuanzong's loneliness after returning to Chang'an in a strong tone:
"In the evening, the fireflies in the palace are quietly thinking, and the solitary lamp is exhausted before they fall asleep." Hope. Meeting in a dream is like "after so many years of life and death, the soul never came to dream." Up to this point, it can be said that the bitter love between life and death has been written to the extreme, but the next layer is pushed aside, and another story is written about Linqiong Taoist Hongdu Ke who went to heaven and earth to search for Xuanzong, and met the immortal in the fairy mountain after his death. Concubine Yang. It seemed that the lovers separated by life and death could meet again, but in another twist, Yang Guifei's soul could not go back. "Love is endless in Zhaoyang Palace, and the sun and moon grow long in Penglai Palace." At this time, readers will feel a sense of despair on behalf of Emperor Xuanzong of the Tang Dynasty. However, in another turn, it is Concubine Yang who asks the Taoist priest to bring the love token to Xuanzong and review the old alliance oath:
"But the order My heart is as strong as gold, and we will see each other in heaven and earth. I sent a farewell message again, and in the words I vowed to know each other: On July 7th, when no one is whispering in the Changsheng Palace, I wish to be a winged bird in the sky, and a twig in the earth. "This is a deep affection that can never be realized without leaving only nostalgia, so Bai Juyi wrote at the end:
Eternal time will eventually end, and this hatred will last forever!
Therefore, what "Song of Everlasting Regret" leaves readers is not mainly a moral lesson of "punishing beauty", but a deep feeling of unforgettable love.