How does Crane develop these themes?

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Read the poem.
A Man Said to the Universe
by Stephen Crane
A man said to the universe:
“Sir, I exist!”
“However,” replied the universe,
“The fact has not created in me
A sense of obligation.”
Respond to the prompt.
In “A Man Said to the Universe,” Crane develops several
themes. One theme Crane develops is that it is human nature to seek validation
of one’s importance. Another theme is that people are all the same in the eyes
of the universe.
How does Crane develop these themes? How do the two themes
interact and build on one another to convey a larger message? Use evidence from
the text to support your answer.