An ancient poem about rain: "Happy Rain on a Spring Night" (Du Fu of the Tang Dynasty), good rain knows the season, and spring will happen. Sneaking into the night with the wind, moistening things silently. The wild paths are all dark with clouds, but the river boats are only bright with fire. Look at the red and wet place at dawn, the flowers are heavy on the official city.
"The Night Rain Sends to the North" (Li Shangyin), the king asked about the return date but has not yet arrived, the night rain in Bashan swelled the autumn pond. How can I cut off the candles from the west window and talk about the rainy night in Bashan?
The poet of "Spring Night Happy Rain" after a period of wandering life, came to settle in Chengdu, where he began a relatively stable life.
When he wrote this poem, he had been living in a thatched cottage in Chengdu for two years. During this time, he personally farmed, planted vegetables and flowers, and interacted with farmers. Therefore, in the poet's eyes, spring rain is "good rain" because it knows the season and moistens things silently.