“I believe in the equality of rights of all mankind.”

"Debate with Jefferson Davis"

2018, Nelson Mandela Annual Lecture (2018)
Context: So, on Madiba’s 100th birthday, we now stand at a crossroads – a moment in time at which two very different visions of humanity’s future compete for the hearts and the minds of citizens around the world. Two different stories, two different narratives about who we are and who we should be. How should we respond?
Should we see that wave of hope that we felt with Madiba’s release from prison, from the Berlin Wall coming down – should we see that hope that we had as naïve and misguided? Should we understand the last 25 years of global integration as nothing more than a detour from the previous inevitable cycle of history — where might makes right, and politics is a hostile competition between tribes and races and religions, and nations compete in a zero-sum game, constantly teetering on the edge of conflict until full-blown war breaks out? Is that what we think?
Let me tell you what I believe. I believe in Nelson Mandela’s vision. I believe in a vision shared by Gandhi and King and Abraham Lincoln. I believe in a vision of equality and justice and freedom and multi-racial democracy, built on the premise that all people are created equal, and they’re endowed by our creator with certain inalienable rights. And I believe that a world governed by such principles is possible and that it can achieve more peace and more cooperation in pursuit of a common good. That’s what I believe.
And I believe we have no choice but to move forward; that those of us who believe in democracy and civil rights and a common humanity have a better story to tell. And I believe this not just based on sentiment, I believe it based on hard evidence.

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.

Source: Social Problems (1883), Ch. 21 : Conclusion
Context: Those who are most to be considered, those for whose help the struggle must be made, if labor is to be enfranchised, and social justice won, are those least able to help or struggle for themselves, those who have no advantage of property or skill or intelligence, — the men and women who are at the very bottom of the social scale. In securing the equal rights of these we shall secure the equal rights of all.
Hence it is, as Mazzini said, that it is around the standard of duty rather than around the standard of self-interest that men must rally to win the rights of man. And herein may we see the deep philosophy of Him who bade men love their neighbors as themselves.
In that spirit, and in no other, is the power to solve social problems and carry civilization onward.

Speech in West Calder, Scotland (27 November 1879), quoted in W. E. Gladstone, Midlothian Speeches 1879 (Leicester University Press, 1971), p. 123.
1870s

where there is no Catholic vote, no anti-Catholic vote, no bloc voting of any kind — and where Catholics, Protestants and Jews, at both the lay and pastoral level, will refrain from those attitudes of disdain and division which have so often marred their works in the past, and promote instead the American ideal of brotherhood.
1960, Speech to the Greater Houston Ministerial Association

"Playboy Interview: Madalyn Murray", Playboy (October 1965)