This poem is one of loneliness. It has a feeling of isolation and desperation. There is a sadness about the whole poem.
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
This is the first line of the poem. It shows us, from the very opening lines, that the narrator is suffering. He is lonely. The word acquaintance usually means someone who is not a real friend, just someone or something we know superficially. However the narrator of the poem knows the night well. It is familiar to him. It represents what he feels on the inside and can be seen as his inner self.
Robert Frost suffered from depression during his life. This poem can be seen as representing his time in suffering. The poem shows us that he is lonely and the city itself is lonely. When he meets another person, he can't express how he is feeling. He thinks no one will understand him. People who don't have to deal with depression, are associated with the day, but the narrator of the poem, struggles with it and therefore is acquainted with the night. When he hears a distant cry, he realizes that it is not for him, because there is no one at home waiting for him.
Robert Frost often used nature in his works to set up a feeling of the poem. He is often known for asking questions about existence. He has also written a lot about the starkness of loneliness. This poem resonates with people who are struggling to find balance in their lives, and live in the darkness of depression.