
1920s, Speech on the Anniversary of the Declaration of Independence (1926)
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.
1920s, Speech on the Anniversary of the Declaration of Independence (1926)
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)
Statement at the Knesset upon receiving the Wolf Prize, May 9, 2004, transcript online https://electronicintifada.net/content/daniel-barenboims-statement-knesset-upon-receiving-wolf-prize-may-9-2004/5080 (16 May 2004) at The Electronic Intifada.
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.
1920s, Speech on the Anniversary of the Declaration of Independence (1926)
Letter to George Richards Minot (June 12, 1789), reported in Fisher Ames, Seth Ames, John Thornton Kirkland, Works of Fisher Ames: With a Selection from His Speeches and Correspondence (1854), p. 54.
The Declaration of Independence: A Study in the History of Political Ideas (1922)
Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 44 - (Gandhi said the same thing in All men are brothers; Simone Weil too, at the beginning of L'enracinement (the translator).
Those are undeniable truths.
Vietnamese Proclamation of Independence (2 September 1945), Ho Chi Minh, Selected Works (1960-1962), Vol. 3, pp. 17-21