The Declaration of Independence: A Study in the History of Political Ideas (1922)
“Abraham Lincoln was self-educated. His curriculum included Shakespeare, the Bible, Euclid and the Declaration of Independence, the monuments to the freedom of the human soul, the possession not of western man, but of a humanity compounded of all colors and every condition. In Independence Hall on February 22, 1861, Lincoln asked what it was, above all else, that went forth to the world on July 4, 1776. It was not, he said, the mere matter of the separation of the colonies from the motherland, but something in that Declaration giving hope to the world for all future time. The declaration gave promise that in due time the weights would be lifted from the shoulders of all men, and that all would have an equal chance. These are the principles upon which the Republican Party must stand, in 1996 no less than in 1860.”
1990s, The Party of Lincoln vs. The Party of Bureaucrats (1996)
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Harry V. Jaffa 171
American historian and collegiate professor 1918–2015Related quotes

Arnold Hunt, curator at the British Library, says King George never kept a diary http://www.npr.org/templates/story/story.php?storyId=11703583.
Misattributed

1960s, Emancipation Proclamation Centennial Address (1962)

2000s, God Bless America (2008), Slavery and the American Cause
Context: The Declaration of the causes and Necessity of Taking up Arms, on July 6, 1775, was the very first occasion for the American people to speak to the world with a single voice. In its first sentence, the Second Continental Congress affirmed without equivocation that the idea of the ownership of some human beings by other human beings was an utter absurdity, and that to think otherwise was incompatible with reason or revelation. Thus from the outset—a year before the Declaration of Independence—the American people were committed to the antislavery cause, and to the inseparability of personal freedom and free government. The American people knew from the outset that the cause of their own freedom and that of the slaves was inseparable. This would become the message that Abraham Lincoln would bring to the American people, and to the world, for all time.

1870s, Oratory in Memory of Abraham Lincoln (1876)
Context: Can any colored man, or any white man friendly to the freedom of all men, ever forget the night which followed the first day of January 1863, when the world was to see if Abraham Lincoln would prove to be as good as his word? I shall never forget that memorable night, when in a distant city I waited and watched at a public meeting, with three thousand others not less anxious than myself, for the word of deliverance which we have heard read today. Nor shall I ever forget the outburst of joy and thanksgiving that rent the air when the lightning brought to us the emancipation proclamation. In that happy hour we forgot all delay, and forgot all tardiness, forgot that the President had bribed the rebels to lay down their arms by a promise to withhold the bolt which would smite the slave-system with destruction; and we were thenceforward willing to allow the President all the latitude of time, phraseology, and every honorable device that statesmanship might require for the achievement of a great and beneficent measure of liberty and progress.

2010s, Interview with Eric Benson (2012)

2000s, The Real Abraham Lincoln: A Debate (2002), Q&A