What is the significance of this sentence in debs's speech?

Read o captain! my captain! by walt whitman, 1819 - 1892 and tell me the theme

Describe thomas jefferson purpose for writing the declaration of independence.then analyze how his use of pathos develop this purpose. be sure to use specific details from the text to support your ideas.

Which sentence in this excerpt from the time machine suggest that the time travelled will later realize that his assumptions about future society are incorrect