“Men of mixed blood in this country apply the name 'negro' to themselves, not because it is a correct ethnological description, but to seem especially devoted to the black side of their parentage. Hence in some cases they are more noisily opposed to the conclusion to which I have come, than either the white or the honestly black race. The opposition to amalgamation, of which we hear so much on the part of colored people, is for most part the merest affectation, and, will never form an impassable barrier to the union of the two varieties.”
1880s, The Future of the Colored Race (1886)
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Frederick Douglass 274
American social reformer, orator, writer and statesman 1818–1895Related quotes

1860s, Our Composite Nationality (1869)

1880s, The Future of the Colored Race (1886)
As quoted by Joe Romersa (c. 1992)
Shadowbox Studio

1920s, The Progress of a People (1924)
Context: In such a view of the history of the Negro race in America, we may find the evidences that the black man's probation on this continent was a necessary part in a great plan by which the race was to be saved to the world for a service which we are now able to vision and, even if yet somewhat dimly, to appreciate. The destiny of the great African continent, to be added at length — and in a future not now far beyond us — to the realms of the highest civilization, has become apparent within a very few decades. But for the strange and long inscrutable purpose which in the ordering of human affairs subjected a part of the black race to the ordeal of slavery, that race might have been assigned to the tragic fate which has befallen many aboriginal peoples when brought into conflict with more advanced communities. Instead, we are able now to be confident that this race is to be preserved for a great and useful work. If some of its members have suffered, if some have been denied, if some have been sacrificed, we are able at last to realize that their sacrifices were borne in a great cause. They gave vicariously, that a vastly greater number might be preserved and benefited through them. The salvation of a race, the destiny of a continent, were bought at the price of these sacrifices.

originally attributed in 1952 to an "Emanuel" Rabinovitch, who appears to be a fictional creation of Eustace Mullins
Misattributed

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA239 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 239
1860s, Speech (October 1860)

I imagine that in his ancestral line, one Israelite woman married a white man. Still, he's an Israelite.
Restoration Through Indemnity And America's Role http://www.tparents.org/Moon-Talks/SunMyungMoon75/SunMyungMoon-750323.htm 1974-03-23