What feelings does the fourth poem at Jingmen Ferry express for the poet?

Farewell through Jingmen

Lipper

Sail from Jingmen Ferry, and soon you will be with southerners.

At the end of the mountain range and the beginning of the plain, the river winds through the wilderness.

The moon rises like a mirror, and the sea clouds twinkle like palaces.

Still connected to the water in my hometown, pull your boat for 300 miles.

This poem is Li Baichu's visit to Chu. With fresh and elegant brushwork, it depicts the novel scenes seen on the east and west sides of the Yangtze River, and expresses the poet's happy mood and broad-minded mind from the beginning of Shu to the plain.

The fourth sentence describes the poet's reluctance to part with the river, but it clearly embodies the poet's optimistic spirit of "serving the country with a sword and traveling far away from relatives".