“We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.”

That differences of race, color, and creed are natural, and that diverse groups, institutions, and ideas are stimulating factors in the development of man;
That to promote harmony in diversity is a responsible task of religion and statesmanship;
That since no individual can express the whole truth, it is essential to treat with understanding and good will those whose views differ from our own;
That by the testimony of history intolerance is the door to violence, brutality and dictatorship; and
That the realization of human interdependence and solidarity is the best guard of civilization.
Declaration of INTERdependence (1945)

Writing in Reason and Passion: Justice Brennan's Enduring Influence (1997).

2000s, 2002, State of the Union address (January 2002)

1990s, Nobel Prize acceptance speech (1993)
Context: Together, we join two distinguished South Africans, the late Chief Albert Lutuli and His Grace Archbishop Desmond Tutu, to whose seminal contributions to the peaceful struggle against the evil system of apartheid you paid well-deserved tribute by awarding them the Nobel Peace Prize. It will not be presumptuous of us if we also add, among our predecessors, the name of another outstanding Nobel Peace Prize winner, the late Rev Martin Luther King Jr. He, too, grappled with and died in the effort to make a contribution to the just solution of the same great issues of the day which we have had to face as South Africans. We speak here of the challenge of the dichotomies of war and peace, violence and non-violence, racism and human dignity, oppression and repression and liberty and human rights, poverty and freedom from want.

Day of Affirmation Address (1966)
Context: This is a Day of Affirmation, a celebration of liberty. We stand here in the name of freedom.
At the heart of that Western freedom and democracy is the belief that the individual man, the child of God, is the touchstone of value, and all society, groups, the state, exist for his benefit. Therefore the enlargement of liberty for individual human beings must be the supreme goal and the abiding practice of any Western society.
The first element of this individual liberty is the freedom of speech: the right to express and communicate ideas, to set oneself apart from the dumb beasts of field and forest; to recall governments to their duties and obligations; above all, the right to affirm one's membership and allegiance to the body politic — to society — to the men with whom we share our land, our heritage, and our children's future.

Part Two : Metaphysical Principles of Virtue
Metaphysics of Morals (1797)

As quoted in The Harper Book of Quotations (1993) by Robert I. Fitzhenry, p. 223

Art and Law, Riders on Earth (1978)

Source: Anti-Freud (1990), p. 44.