It expresses the philosophy of life and encourages or warns others to cherish time.
This sentence comes from Du Mu's seven-character quatrain "Three Poems of Wang Shaohua" in Tang Dynasty. The whole poem is as follows: As you get older, your heart and Qingyun have their own period. Today, there is no inner reach to Qingfeng, and the world is too tired to be sad. Polly doesn't talk back, it's at the beginning, right and wrong don't distinguish. When the name turned out to be unprovoked, I was ashamed to go to Ailing Mountain Road. Seeing the clouds and cranes don't go hand in hand, let alone working in the dust. Go deep into the cave with a feather man and listen to the jade in autumn months ago.
This work describes the poet's love for Shaohua Mountain. The use of foil and other techniques in the poem reveals the poet's sense of loss caused by being dragged down by mundane things and unable to accompany him. The language of poetry is concise and the charm is implicit, which is to express comfort to others or to warn others to cherish time.