What kind of thoughts and feelings does the poem "turning into spring mud to protect flowers more" express?

Falling red is not heartless, but turning into spring mud protects flowers more. "The poet turned from expressing his feelings of parting to expressing his ambition to serve the country." On the other hand, in the words of Lu You: "Scattered into mud, crushed into dust, only the fragrance remains." Falling in love originally refers to the flowers blooming on the branches, but it is not something without feelings. Even if it turns into spring mud, it is willing to cultivate beautiful spring flowers to grow. Not for the unique fragrance, but to protect the flowers. It shows that although the poet is divorced from officialdom, he still cares about the fate of the country and never forgets his ambition to serve the country, which fully expresses the poet's strong feelings and becomes a famous sentence handed down from generation to generation.