I have been one acquainted with the night.
I have walked out in rain—and back in rain.
I have outwalked the furthest city light.
I have looked down the saddest city lane.
The repetition of the first line of the poem provides a closure to the whole poem. It also emphasizes the narrator’s relationship to the “night,” which as mentioned before could represent his loneliness and depression. The repetition also symbolizes that nothing has changed for the narrator; he still continues to be lonely and the walks at night still continue. His acquaintance with the “night” is a cyclical action. Even though he will continue walking at night, the night will still be an acquaintance to him since he feels alone and unconnected to anyone. 

Acquainted with the Night