Reverence and gratitude for light. The main theme of Ai Qing's "Hymn of Light" is: yearning and passionate pursuit of ideals and a better life. Hatred of darkness, praise and yearning for light. In the poem, the author expresses his reverence and gratitude for light by describing the characteristics and functions of light, such as the arrival of light, the selfless dedication of light, the importance and power of light, etc. At the same time, the poem also shows the author's love and cherishment of life.