“That one man can run faster than another is no reason to prevent the latter from entering the race. Indeed, until the race is run, how do we know who can run faster? In comparing the known inequalities among whites to the alleged inequalities between blacks and whites, Wilson illuminates the logical and moral irrelevance of the distinction of the races in considering the principles of republican government. Nevertheless, this topic could not be addressed in the pure light of reason and nature, because public opinion, North or South, would not permit it.”
Source: 2000s, A New Birth of Freedom: Abraham Lincoln and the Coming of the Civil War (2000), pp. 228–229
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Harry V. Jaffa 171
American historian and collegiate professor 1918–2015Related quotes

The Evolutionary Future of Man (1993)
Source: Black Theology and Black Power (1969), p. 14-16

“In philosophy the race is to the one who can run slowest—the one who crosses the finish line last.”
In Rennen der Philosophie gewinnt, wer am langsamsten laufen kann. Oder: der, der das Ziel zuletzt erreicht.
Source: Culture and Value (1980), p. 40e

This is from a fictional speech by Lincoln which occurs in The Clansman : An Historical Romance of the Ku Klux Klan (1905) by Thomas Dixon, Jr.. On some sites this has been declared to be something Lincoln said "soon after signing" the Emancipation Proclamation, but without any date or other indications of to whom it was stated, and there are no actual historical records of Lincoln ever saying this.
Misattributed

Part III: Nice Meeting You, and Goodbye
The Courage to Stand Alone (2001)

"Duke Speaks Out," in The Crusader, a Knights of the KKK newsletter (November 1978)

“I think it however a greater evil to the white man than to the black race”
Letter to his wife, Mary Anne Lee http://www.fair-use.org/robert-e-lee/letter-to-his-wife-on-slavery (27 December 1856)
1850s
Context: In this enlightened age, there are few I believe, but what will acknowledge, that slavery as an institution, is a moral & political evil in any Country. It is useless to expatiate on its disadvantages. I think it however a greater evil to the white man than to the black race, & while my feelings are strongly enlisted in behalf of the latter, my sympathies are more strong for the former. The blacks are immeasurably better off here than in Africa, morally, socially & physically. The painful discipline they are undergoing, is necessary for their instruction as a race, & I hope will prepare & lead them to better things. How long their subjugation may be necessary is known & ordered by a wise Merciful Providence.