How we cite our quotes: (Line)
Quote #1
Lift every voice and sing
Till earth and heaven ring,
Ring with the harmonies of Liberty (1-3)
The reference to "Liberty" in these first three lines clues us into the fact that this is a poem about race. The struggle against racial oppression is a struggle for liberty, after all. These lines also suggest the power of singing and, by extension, voicing our desire for freedom. If the speakers just sing loud enough, and demand their freedom insistently enough, they'll achieve "the harmonies of liberty."
Quote #2
Stony the road we trod
Bitter the chast'ning rod (11-12)
The metaphors of the "stony" road and "the chast'ning rod" allude to the long history of racial oppression in America. African-Americans had to tread a difficult path, first as slaves, and then as second-class citizens.
Quote #3
Yet with a steady beat,
Have not our weary feet
Come to the place for which our father sighed? (14-16)
The "fathers" in line 16 are the slave ancestors of the speakers of this poem. Those slave forefathers "sighed" for freedom, they wanted it for their children. And though they didn't live to see it, their children did achieve freedom from slavery. The image of the "weary feet" is another metaphor that suggests the very "weary" lives that African-Americans have had to lead in America.