The central idea of the given stanza is to show that the speaker is a nobody and also that there is banishment waiting if people find out that they are nobodies.
This is shown in the given lines: "I’m nobody! Who are you?
Are you nobody, too?
Then there’s a pair of us—don’t tell!
They’d banish us, you know."
This refers to the main reason why an author writes a text or stanza as he wants to convey an idea to his audience.
Hence, we can see that based on the given lines in the poem, there is the narration of the words of the speaker who declares that he is a nobody and urges for silence so that they would not be banished.
Your question is incomplete, a general overview was given.
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