Source: Black Theology and Black Power (1969), p. 14-16
“We can move in that direction as a country, in greater polarization -- black people amongst blacks, and white amongst whites, filled with hatred toward one another. Or we can make an effort”
Speech on the Assassination of Martin Luther King, Jr. (1968)
Context: Martin Luther King dedicated his life to love and to justice between fellow human beings. He died in the cause of that effort. In this difficult day, in this difficult time for the United States, it's perhaps well to ask what kind of a nation we are and what direction we want to move in. For those of you who are black -- considering the evidence evidently is that there were white people who were responsible -- you can be filled with bitterness, and with hatred, and a desire for revenge. We can move in that direction as a country, in greater polarization -- black people amongst blacks, and white amongst whites, filled with hatred toward one another. Or we can make an effort, as Martin Luther King did, to understand, and to comprehend, and replace that violence, that stain of bloodshed that has spread across our land, with an effort to understand, compassion, and love. [... ] But we have to make an effort in the United States. We have to make an effort to understand, to get beyond, or go beyond these rather difficult times.
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Robert F. Kennedy 72
American politician and brother of John F. Kennedy 1925–1968Related quotes

Speech on the Assassination of Martin Luther King, Jr. (1968)
As quoted by Joe Romersa (c. 1992)
Shadowbox Studio

In June 1947, addressing the head committee of the United Party in Transvaal, cited by Tom MacDonald (1948) in Jan Hofmeyr: Heir to Smuts, p. 219
On the Economic Partnership Agreement (EPA), in Will Ross, " Africans wary of Europe's trade offer http://news.bbc.co.uk/2/hi/africa/7134407.stm", BBC (8 December, 2007).

“Are we to mark this day with a white or a black stone?”
Source: Don Quixote de la Mancha (1605–1615), Part II (1615), Book III, Ch. 10.

OK who's going to identify that?
The Guardian, Saturday 26 April 2008

"Change the Joke and Slip the Yoke" (1958), in The Collected Essays, ed. John F. Callahan (New York: Modern Library, 1955), p. 104.