Final answer:
The difference between the original line and Auden's edit is in the conjunction used, 'and' versus 'or.' The original line emphasizes choice, while Auden's edit emphasizes inevitability. Both versions convey a similar message of the importance of love.
Step-by-step explanation:
In the poem 'September 1, 1939,' the original line is 'We must love one another and die,' while Auden's edit is 'We must love one another or die.' The difference between the two lies in the conjunction used, 'and' versus 'or.' The original line emphasizes a choice, suggesting that we must love one another even in the face of death, while Auden's edit emphasizes inevitability, implying that loving one another is necessary to avoid a negative outcome. Both versions convey a similar message of the importance of love, but with slightly different nuances.