“If the slave-power could now in good faith stand where the fathers stood, with the added lights of experience shining upon the question, asking sympathy and co-operation in a system of emancipation, pleading that it was unfair to ask them to make greater sacrifices than other men are willing to make, allowing that it was a common evil, the cost and trouble of whose removal should be cheerfully borne by all, or if the laws of any slave state looked towards the gradual relief of the difficulty, there is not an honest man in the North or the South whose heart would not tremble with joy as he contemplated the destiny of his country.”

Our Blood 1976 as quoted in The Suffering Will Not Be Televised: African American Women and Sentimental by Rebecca Wanzo

1850s, The Present Aspect of the Slavery Question (1859)
Context: Our fathers, therefore, were fully alive to the scope of their words and their work; and thus, as I believe, the Constitution of the United States, in its essential spirit and intention, recognizes the essential manhood of Dred Scott as absolutely as it does that of the President, of the Chief Justice, or of any Senator of the United States. I think I have not unfairly stated the spirit of the age, the sentiments of the fathers, and the original doctrine of this government upon the question of slavery. The system was recognized by law, but it was considered an evil which Time was surely removing. And, as if to put this question at rest forever, to show that the framers of this government did not look forward to a continuance of slavery, Mr. Stephens of Georgia, the most sagacious of the living slavery leaders, says, in June of this year, 'The leading public men of the South, in our early history, were almost all against it. Jefferson was against it. This I freely admit, when the authority of their names is cited. It was a question which they did not, and perhaps could not, thoroughly understand at that time'.

1880s, Personal Memoirs of General U. S. Grant (1885)
Context: Slavery was an institution that required unusual guarantees for its security wherever it existed; and in a country like ours where the larger portion of it was free territory inhabited by an intelligent and well-to-do population, the people would naturally have but little sympathy with demands upon them for its protection. Hence the people of the South were dependent upon keeping control of the general government to secure the perpetuation of their favorite institution. They were enabled to maintain this control long after the States where slavery existed had ceased to have the controlling power, through the assistance they received from odd men here and there throughout the Northern States. They saw their power waning, and this led them to encroach upon the prerogatives and independence of the Northern States by enacting such laws as the Fugitive Slave Law. By this law every Northern man was obliged, when properly summoned, to turn out and help apprehend the runaway slave of a Southern man. Northern marshals became slave-catchers, and Northern courts had to contribute to the support and protection of the institution.

Source: The Meaning of a Liberal Education (1926), p. 85

Native Son (1940)

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXVI: On Various Aspects of Virtue

The Cornerstone Speech (1861)

Letter from the commissioners (John Adams, Thomas Jefferson) to John Jay, 28 March 1786, in Thomas Jefferson Travels: Selected Writings, 1784-1789, by Anthony Brandt, pp. 104-105 http://books.google.com/books?id=SY_3VKP0SEkC&pg=PA104&dq=%22Ambassador+Answered%22
1780s
Context: We took the liberty to make some enquiries concerning the ground of their pretensions to make war upon nations who had done them no injury, and observed that we considered all mankind as our friends who had done us no wrong, nor had given us any provocation. The Ambassador [of Tripoli] answered us that it was founded on the Laws of their Prophet, that it was written in their Koran, that all nations who should not have acknowledged their authority were sinners, that it was their right and duty to make war upon them wherever they could be found, and to make slaves of all they could take as Prisoners, and that every Musselman who should be slain in battle was sure to go to Paradise.

2000s, The Real Abraham Lincoln: A Debate (2002), The Right of Secession Is Not the Right of Revolution