“I am obliged to confess that I do not regard the abolition of slavery as a means of warding off the struggle of the two races in the Southern states. The Negroes may long remain slaves without complaining; but if they are once raised to the level of freemen, they will soon revolt at being deprived of almost all their civil rights; and as they cannot become the equals of the whites, they will speedily show themselves as enemies.”

Fourth Lincoln-Douglass Debate http://www.nps.gov/liho/learn/historyculture/debate4.htm (September 1858)
1850s

In a statement arguing that would have been practically impossible to prevent Hartfield's lynching
1919

Source: Writings, Politics of Guilt and Pity (1978), pp. 3-4

Source: Liberty, Equality, Fraternity (1873-1874), Ch. 1
Context: I am not the advocate of Slavery, Caste, and Hatred, nor do I deny that a sense may be given to the words, Liberty, Equality, and Fraternity, in which they may be regarded as good. I wish to assert with respect to them two propositions.
First, that in the present day even those who use those words most rationally — that is to say, as the names of elements of social life which, like others, have their advantages and disadvantages according to time, place, and circumstance — have a great disposition to exaggerate their advantages and to deny the existence, or at any rate to underrate the importance, of their disadvantages.
Next, that whatever signification be attached to them, these words are ill-adapted to be the creed of a religion, that the things which they denote are not ends in themselves, and that when used collectively the words do not typify, however vaguely, any state of society which a reasonable man ought to regard with enthusiasm or self-devotion.

Fourth Lincoln-Douglas Debate (Charleston, 18 September 1858)
1850s, Lincoln–Douglas debates (1858)
Context: While I was at the hotel to-day, an elderly gentleman called upon me to know whether I was really in favor of producing perfect equality between the negroes and white people. While I had not proposed to myself on this occasion to say much on that subject, yet as the question was asked me, I thought I would occupy perhaps five minutes in saying something in regard to it. I will say then that I am not, nor ever have been, in favor of bringing about in any way the social and political equality of the white and black races, that I am not, nor ever have been, in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people; and I will say in addition to this that there is a physical difference between the white and black races which I believe will forever forbid the two races living together on terms of social and political equality. And inasmuch as they cannot so live, while they do remain together there must be the position of superior and inferior, and I as much as any other man am in favor of having the superior position assigned to the white race. I say upon this occasion I do not perceive that because the white man is to have the superior position the negro should be denied every thing. I do not understand that because I do not want a negro woman for a slave I must necessarily want her for a wife. My understanding is that I can just let her alone. I am now in my fiftieth year, and I certainly never had a black woman for either a slave or a wife. So it seems to me quite possible for us to get along without making either slaves or wives of negroes. I will add to this that I have never seen, to my knowledge, a man, woman, or child who was in favor of producing a perfect equality, social and political, between negroes and white men... I have never had the least apprehension that I or my friends would marry negroes if there was no law to keep them from it, but as Judge Douglas and his friends seem to be in great apprehension that they might, if there were no law to keep them from it, I give him the most solemn pledge that I will to the very last stand by the law of this State, which forbids the marrying of white people with negroes.

1860s, Allow the humblest man an equal chance (1860)

Source: http://www.nydailynews.com/news/politics/2010/05/21/2010-05-21_nothing_is_out_of_bounds_for_national_tea_party_express_foulmouthed_leader_mark_.html#ixzz0oxS7r1Rj

Speech (1848-05-20) in the case of John Mitchel, Young Irelander and one of the Irish Confederation Leaders. Mitchel was later sentenced to fourteen years transportation.

[McClarey, Donald R, Father John Ireland and the Fifth Minnesota, The American Catholic, 2012-08-23, https://the-american-catholic.com/2012/08/23/father-john-ireland-and-the-fifth-minnesota/, 2018-02-04] [Source for quote doesn't list primary source., February 2018]