This poem comes from the mythical story "Chang'e Flying to the Moon".
Original poem:
The candle shadow on the mica screen is deep, and the long river is gradually setting and the dawn stars are sinking.
Chang'e should regret stealing the elixir, and her heart will be filled with blue sea and blue sky every night.
Translation:
Through the screen decorated with mica, the shadow of the candle gradually dimmed. The Milky Way gradually sinks, and the morning stars gradually disappear. Chang'e regretted being lonely and secretly taking the elixir. Now only the blue sky and blue sea accompany her lonely heart every night.
Source: "Chang'e" by Li Shangyin of the Tang Dynasty
Extended information:
Chang'e ascended to the moon palace because of the elixir, but she also lost the warmth of the world. Since then, she has suffered from inner loneliness and the coldness of the moon palace; because of her spiritual practice, Nu Guan was able to escape from the troubled world and gain a quiet place, but she also lost the colorful life of the secular world and suffered from the inability to meet her sexual needs.
The poet obtained the title of Jinshi due to the help of the Linghu family, but he was locked up and unable to be independent; he also sympathized with and followed the members of the Li Party and became a righteous person, but he also lost the support of the dignitaries. Since then, he has been trapped in the exclusion, attack and revenge of those in power and has been unable to escape.
In fact, things in the world are often like this. When people work hard to achieve the ideal state in their minds, sometimes they unexpectedly feel that they are not as complete and happy as they imagined. Instead, they feel lost, or even Regret.