There is a poem that says you won't go back to your hometown until you achieve something. What does it mean?

The child is determined to go to the countryside, or he will not return if he succeeds. There is no need to bury the bones, life is everywhere!

This poem comes from 1909 Mao Zedong's Four Musts: Changing Saigō Takamori's Poems to Father, and is adapted from the poem of Saigō Takamori, a famous military commander during the Meiji Restoration. The original poem is as follows:

The men are determined to go to the countryside,

If you don't learn to be famous, you won't return it.

Why bury bones in mulberry fields,

Life is everywhere.

-Saigō Takamori's poems

Literally, a good man is ambitious. In order to realize his ideal and ambition, he should not covet every tree and grass in his hometown, but should be at home all over the world.