To reflect Lincoln's concern about the nation's freedom and the government of the people, the two lines from King's letter that best align with this idea are:
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“...and still fewer have the vision to see that injustice must be rooted out by strong, persistent, and determined action.”
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“...when these disinherited children of God sat down at lunch counters they were in reality standing up for the best in the American dream…”
Both of these lines emphasize the importance of addressing injustice and the struggle for civil rights, which align with Lincoln's vision of a nation dedicated to freedom and equality for all its people.