“Five decades ago today, Americans came to this honored place to lay claim to a promise made at our founding: “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are Life, Liberty and the pursuit of Happiness.” In 1963, almost 200 years after those words were set to paper, a full century after a great war was fought and emancipation proclaimed, that promise -- those truths -- remained unmet. And so they came by the thousands from every corner of our country, men and women, young and old, blacks who longed for freedom and whites who could no longer accept freedom for themselves while witnessing the subjugation of others. And so they came by the thousands from every corner of our country, men and women, young and old, blacks who longed for freedom and whites who could no longer accept freedom for themselves while witnessing the subjugation of others.”

1850s, The Present Aspect of the Slavery Question (1859)
Context: Such is the present aspect of the slavery question. For myself, I believe that the faith in which the government was founded still survives. I believe that the spirit of despotism which now says to the country, 'I will rule or ruin', will hear the imperial voice of the conscience of the American people, recognizing that justice and prosperity walk hand in hand, saying, 'You will do neither'. I believe that God did not hide this continent through all time as the spot whereon a nation should be planted upon the only principle that can render a nation as permanent as the race, to suffer the experiment to fail within a century. I believe these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain inalienable rights, that among these are life, liberty, and the pursuit of happiness. Do you believe it? If aye, let us go into the battle, and God speed the right.

1770s, Declaration of Independence (1776)

Those are undeniable truths.
Vietnamese Proclamation of Independence (2 September 1945), Ho Chi Minh, Selected Works (1960-1962), Vol. 3, pp. 17-21

2016, DNC Address (July 2016)
Context: America is already great. America is already strong. And I promise you, our strength, our greatness, does not depend on Donald Trump. In fact, it doesn’t depend on any one person. And that, in the end, may be the biggest difference in this election — the meaning of our democracy.
Ronald Reagan called America “a shining city on a hill.” Donald Trump calls it “a divided crime scene” that only he can fix. It doesn’t matter to him that illegal immigration and the crime rate are as low as they’ve been in decades — (applause) — because he’s not actually offering any real solutions to those issues. He’s just offering slogans, and he’s offering fear. He’s betting that if he scares enough people, he might score just enough votes to win this election.
And that's another bet that Donald Trump will lose. And the reason he'll lose it is because he’s selling the American people short. We're not a fragile people. We're not a frightful people. Our power doesn’t come from some self-declared savior promising that he alone can restore order as long as we do things his way. We don’t look to be ruled. Our power comes from those immortal declarations first put to paper right here in Philadelphia all those years ago: We hold these truths to be self-evident, that all men are created equal; that We the People, can form a more perfect union.
That's who we are. That’s our birthright — the capacity to shape our own destiny.

First Woman's Rights Convention, Seneca Falls, New York, [July, 19-20, 1848]. Declaration of Sentiments.

On parental rights: Troxel v. Granville (2000) (dissenting).
2000s

1920s, Equal Rights (1920)
Context: July 4, 1776 was the historic day on which the representatives of three millions of people vocalized Concord, and Lexington, and Bunker Hill, which gave notice to the world that they proposed to establish an independent nation on the theory that all men are created equal, that they are endowed by their creator with certain inalienable rights, that among these are life, liberty, and the pursuit of happiness. The wonder and glory of the American people is not the ringing Declaration of that day, but the action then already begun, and in the process of being carried out, in spite of every obstacle that war could interpose, making the theory of freedom and equality a reality.

Republican Presidential Debate, 2007-10-21, quoted in [The Republican Debate on Fox News Channel, 2007-10-21, The New York Times, http://www.nytimes.com/2007/10/21/us/politics/21debate-transcript.html?pagewanted=9, 2011-03-01]
asked his opinion on Mayor Rudolph Giuliani's position to do nothing to change the laws that keep abortion legal
Republican Debates

1850s, What to the Slave is the Fourth of July? (1852)