Karl Hess, “Letter from Washington: My Taxes,” Libertarian, May 1, 1969, p. 3
“The Declaration of Independence announces the sublime truth, that all power comes from the people. This was a denial, and the first denial of a nation, of the infamous dogma that God confers the right upon one man to govern others.”
Individuality http://www.infidels.org/library/historical/robert_ingersoll/individuality.html (1873).
Context: The Declaration of Independence announces the sublime truth, that all power comes from the people. This was a denial, and the first denial of a nation, of the infamous dogma that God confers the right upon one man to govern others. It was the first grand assertion of the dignity of the human race. It declared the governed to be the source of power, and in fact denied the authority of any and all gods. Through the ages of slavery — through the weary centuries of the lash and chain, God was the acknowledged ruler of the world. To enthrone man, was to dethrone God.
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Robert G. Ingersoll 439
Union United States Army officer 1833–1899Related quotes

Memorial Day address, Arlington National Cemetery (31 May 1976) http://www.presidency.ucsb.edu/ws/index.php?pid=6071
1970s
Context: The founding of our Nation was more than a political event; it was an act of faith, a promise to Americans and to the entire world. The Declaration of Independence declared that people can govern themselves, that they can live in freedom with equal rights, that they can respect the rights of others.
In the two centuries that have passed since 1776, millions upon millions of Americans have worked and taken up arms when necessary to make that dream a reality. We can be extremely proud of what they have accomplished. Today, we are the world's oldest republic. We are at peace. Our Nation and our way of life endure. We are free.

On the United States Declaration of Independence in her "Is It a Crime for a Citizen of the United States to Vote?" speech before her trial for voting (1873)

Speech at Hall of Science c.1880 quoted in An Autobiography of Annie Besant; reported in Edmund Fuller, Thesaurus of Quotations (1941), p. 398; reported as unverified in Respectfully Quoted: A Dictionary of Quotations (1989).
Attributed

1920s, Equal Rights (1920)
Context: The doctrine of the Declaration of Independence predicated upon the glory of man and the corresponding duty to society that the rights of citizens ought to be protected with every power and resource of the state, and a government that does any less is false to the teachings of that great document — false to the name American. The assertion of human rights is naught but a call to human sacrifice. This is yet the spirit of the American people. Only so long as this flame burns shall we endure, and the light of liberty be shed over the nations of the earth. May the increase of the years increase for America only the devotion to this spirit, only the intensity of this flame, and the eternal truth of [Lowell's] lines: "What were our lives without thee, what all our lives to save thee, we reck not what we gave thee, we will not dare to doubt thee; but ask whatever else and we will dare".

1920s, Equal Rights (1920)
Context: Democracy is not a tearing down; it is a building up. It is not denial of the divine right of kings; it supplements that same with the assertion of the divine right of all men. It does not destroy; it fulfills. It is the consummation of all theories of government, the spirit of which all the nations of the earth must yield. It is the great constructive course of the ages. It is the alpha and omega of man's relation to man, the beginning and the end. There is, and can be, no more doubt of the triumphs of democracy in human affairs than there is of the triumph of gravitation in the physical world. The only question is how and when. Its foundation lays hold upon eternity. It is unconcerned with the idolatry, or despotism, or treason, or rebellion, or betrayal, but bows in reverence before Moses, or Hamden, or Washington, or Lincoln, or the lights that shone on Calvary.

1860s, First State of the Union address (1861)
Fighting the Lamb's War: Skirmishes with the American Empire (1996), p. 204