“Lincoln maintains there that the Declaration of Independence asserts that the negro is equal to the white man, and that under Divine law, and if he believes so it was rational for him to advocate negro citizenship, which, when allowed, puts the negro on an equality under the law. I say to you in all frankness, gentlemen, that in my opinion a negro is not a citizen, cannot be, and ought not to be, under the Constitution of the United States. I will not even qualify my opinion to meet the declaration of one of the Judges of the Supreme Court in the Dred Scott case, “that a negro descended from African parents, who was imported into this country as a slave is not a citizen, and cannot be.” I say that this Government was established on the white basis. It was made by white men, for the benefit of white men and their posterity forever, and never should be administered by any except white men. I declare that a negro ought not to be a citizen, whether his parents were imported into this country as slaves or not, or whether or not he was born here. It does not depend upon the place a negro’s parents were born, or whether they were slaves or not, but upon the fact that he is a negro, belonging to a race incapable of self-government, and for that reason ought not to be on an equality with white men.”

Sixth Lincoln-Douglas debate https://cwcrossroads.wordpress.com/2011/01/18/race-and-slavery-north-and-south-some-logical-fallacies/#comment-47553, (13 October 1860), Quincy, Illinois
1860s
Context: You know that in his Charleston speech, an extract from which he has read, he declared that the negro belongs to an inferior race; is physically inferior to the white man, and should always be kept in an inferior position. I will now read to you what he said at Chicago on that point. In concluding his speech at that place, he remarked, 'My friends, I have detained you about as long as I desire to do, and I have only to say let us discard all this quibbling about this man and the other man-this race and that race, and the other race being inferior, and therefore they must be placed in an inferior position, discarding our standard that we have left us. Let us discard all these things, and unite as one people throughout this land until we shall once more stand up declaring that all men are created equal'. Thus you see, that when addressing the Chicago Abolitionists he declared that all distinctions of race must be discarded and blotted out, because the negro stood on an equal footing with the white man; that if one man said the Declaration of Independence did not mean a negro when it declared all men created equal, that another man would say that it did not mean another man; and hence we ought to discard all difference between the negro race and all other races, and declare them all created equal.

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

Speech in Indianapolis, Indiana (26 February 1863).
Quote

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)

1860s, The Constitution of the United States: Is It Pro-Slavery or Anti-Slavery? (1860)
Context: The Constitution itself. Its language is "we the people"; not we the white people. Not even we the citizens, not we the privileged class, not we the high, not we the low, but we the people. Not we the horses, sheep, and swine, and wheel-barrows, but we the people, we the human inhabitants. If Negroes are people, they are included in the benefits for which the Constitution of America was ordained and established. But how dare any man who pretends to be a friend to the Negro thus gratuitously concede away what the Negro has a right to claim under the Constitution? Why should such friends invent new arguments to increase the hopelessness of his bondage? This, I undertake to say, as the conclusion of the whole matter, that the constitutionality of slavery can be made out only by disregarding the plain and common-sense reading of the Constitution itself; by discrediting and casting away as worthless the most beneficent rules of legal interpretation; by ruling the Negro outside of these beneficent rules; by claiming that the Constitution does not mean what it says, and that it says what it does not mean; by disregarding the written Constitution, and interpreting it in the light of a secret understanding. It is in this mean, contemptible, and underhand method that the American Constitution is pressed into the service of slavery. They go everywhere else for proof that the Constitution declares that no person shall be deprived of life, liberty, or property without due process of law; it secures to every man the right of trial by jury, the privilege of the writ of habeas corpus — the great writ that put an end to slavery and slave-hunting in England — and it secures to every State a republican form of government. Anyone of these provisions in the hands of abolition statesmen, and backed up by a right moral sentiment, would put an end to slavery in America.

2000s, The Logic of the Colorblind Constitution (2004)

1860s, Allow the humblest man an equal chance (1860)
Context: So that saying, "in the struggle between the negro and the crocodile," &c., is made up from the idea that down where the crocodile inhabits a white man can't labor; it must be nothing else but crocodile or negro; if the negro does not the crocodile must possess the earth; [Laughter; ] in that case he declares for the negro. The meaning of the whole is just this: As a white man is to a negro so is a negro to a crocodile; and as the negro may rightfully treat the crocodile, so may the white man rightfully treat the negro. This very dear phrase coined by its author, and so dear that he deliberately repeats it in many speeches, has a tendency to still further brutalize the negro, and to bring public opinion to the point of utter indifference whether men so brutalized are enslaved or not.

The Cornerstone Speech (1861)
Context: As I have stated, the truth of this principle may be slow in development, as all truths are and ever have been, in the various branches of science. It was so with the principles announced by Galileo it was so with Adam Smith and his principles of political economy. It was so with Harvey, and his theory of the circulation of the blood. It is stated that not a single one of the medical profession, living at the time of the announcement of the truths made by him, admitted them. Now, they are universally acknowledged. May we not, therefore, look with confidence to the ultimate universal acknowledgment of the truths upon which our system rests? It is the first government ever instituted upon the principles in strict conformity to nature, and the ordination of Providence, in furnishing the materials of human society. Many governments have been founded upon the principle of the subordination and serfdom of certain classes of the same race; such were and are in violation of the laws of nature. Our system commits no such violation of nature’s laws. With us, all of the white race, however high or low, rich or poor, are equal in the eye of the law. Not so with the negro. Subordination is his place. He, by nature, or by the curse against Canaan, is fitted for that condition which he occupies in our system. The architect, in the construction of buildings, lays the foundation with the proper material-the granite; then comes the brick or the marble. The substratum of our society is made of the material fitted by nature for it, and by experience we know that it is best, not only for the superior, but for the inferior race, that it should be so. It is, indeed, in conformity with the ordinance of the Creator. It is not for us to inquire into the wisdom of His ordinances, or to question them. For His own purposes, He has made one race to differ from another, as He has made 'one star to differ from another star in glory'. The great objects of humanity are best attained when there is conformity to His laws and decrees, in the formation of governments as well as in all things else. Our confederacy is founded upon principles in strict conformity with these laws. This stone which was rejected by the first builders “is become the chief of the corner” the real “corner-stone” in our new edifice. I have been asked, what of the future? It has been apprehended by some that we would have arrayed against us the civilized world. I care not who or how many they may be against us, when we stand upon the eternal principles of truth, if we are true to ourselves and the principles for which we contend, we are obliged to, and must triumph.

Gompers, Samuel. The Samuel Gompers Papers. Stuart Bruce Kaufman, Peter J. Albert, Grace Palladino, and Marla J Hughes, eds. Urbana, Ill.: University of Illinois Press, 2000, p. 137.