Delighting in Rain on a Spring Night, what is the truth in this ancient poem?

Du Fu's poem "Delighting in Rain on a Spring Night" is often quoted by people as "moistening things silently", which describes that educating people is carried out in a subtle way and has achieved good results.

this poem uses personification to describe the characteristics of spring rain and the scene of rainy night in Chengdu with great joy, and enthusiastically eulogizes the timely and nourishing spring rain. The description of the spring rain in the poem is subtle, delicate and vivid, drawing sound and shape. The whole poem is elegant in artistic conception, quiet in meaning, and integrated with the painting. It is a poem about rain with vivid and unique charm.

Delighting in Rain on a Spring Night

Good rain knows the season, and spring happens.

sneak into the night with the wind and moisten things silently.

the wild trails are all dark, and the river boats are all bright.

if you look at the red and wet place, flowers will weigh heavily on Jinguan City.