“In like manner the Reverend Dr. William A. Smith, President of the Randolph-Macon College in Virginia, in his work upon the Philosophy and Practice of Slavery, deliberately repudiates Mr. Jefferson's view of slavery as a 'grossly offensive error', and attributes the anti-slavery movement to him – which is as wise as to attribute the motion of the earth to Galileo. Judge Wayne, in his late charge at Savannah upon the law against the slave-trade, confirms Mr. Stephens's statement. And, as if to establish it by the most unexpected testimony, Mr. Edward Everett, in his late discourse upon Daniel Webster, said, 'In common with all, or nearly all, the statesmen of the last generation, he believed that free labor would ultimately prevail throughout the continent.”
1850s, The Present Aspect of the Slavery Question (1859)
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George William Curtis 78
American writer 1824–1892Related quotes

Conclusion
1880s, Personal Memoirs of General U. S. Grant (1885)
Context: The cause of the great War of the Rebellion against the United States will have to be attributed to slavery. For some years before the war began it was a trite saying among some politicians that 'A state half slave and half free cannot exist.' All must become slave or all free, or the state will go down. I took no part myself in any such view of the case at the time, but since the war is over, reviewing the whole question, I have come to the conclusion that the saying is quite true.

Lord George Bentinck: A Political Biography (1852), pp. 324-325.
1850s

1850s, The Present Aspect of the Slavery Question (1859)

2000s, The Real Abraham Lincoln: A Debate (2002), The Right of Secession Is Not the Right of Revolution
Both American and British abolitionists assumed that an end to slave imports would lead automatically to the amelioration and gradual abolition of slavery.
The Problem of Slavery in the Age of Revolution, 1770-1823, page 129. https://books.google.com/books?id=9lsvDwAAQBAJ&pg=PA129

Letter to Pavel Vasilyevich Annenkov, (28 December 1846), Rue d'Orleans, 42, Faubourg Namur, Marx Engels Collected Works Vol. 38, p. 95; International Publishers (1975). First Published: in full in the French original in M.M. Stasyulevich i yego sovremenniki v ikh perepiske, Vol. III, 1912
Source: Europe and the People Without History, 1982, Chapter 11, The Movement of Commodities, p. 316.