What is the theme of the poem?

The poet first wrote from the beautiful moonlight on the riverside, "Lian Haiping is in the spring tide, and the bright moon on the sea is born in the tide." . In the moonlight, the smoke is vast and the river is full of color. The transparent and pure riverside prospect shows the beauty and magic of nature. While feeling the infinite beauty, the poet can't help thinking about the life of the universe: "Who has seen the moon by the river?" When did Jiang Yue take the photo at the beginning of the year? Life is endless from generation to generation, and Jiangyue is only similar year after year; I don't know who Jiang Yue is waiting for, but I see the Yangtze River delivering water. "Time and space are infinite, and life is infinite. He has a deep impression on the universe and shows a vast and profound cosmic consciousness. In the face of the time gone forever like running water, the poet has fallen into infinite sadness and confusion at this time, thus giving a wise and far-reaching sigh of life. Next, the poet began to write from "the white clouds are falling, and the green maple is too sad", describing the parting feelings of the wandering people and the yearning for women, and blending the poet's faint sadness into the quiet poetic realm. This kind of sadness also flows quietly with moonlight and running water.

The whole poem is "I wonder how many people will return every month?" The falling moon shakes the trees all over the river, and my thoughts are full of twists and turns. Readers are immersed in the profound contradiction between the universe and life.