“It occurred to me that there was no difference between men, in intelligence or race, so profound as the difference between the sick and the well.”

On Cuban and U.S. relations in an address at a joint press conference with U.S. President Barack Obama in Havana, Cuba (22 March 2016)
Context: There are profound differences between our countries that will not go away. We hold different concepts on many subjects, such as political systems, democracy, the exercise of human rights, social justice, international relations, and world peace and stability. We defend human rights. In our view, civil, political, economic, social and cultural rights are indivisible, interdependent, and universal. We find it inconceivable that a government does not defend and ensure the right to healthcare, education, social security, food provision, development, equal pay, and the rights of children. We oppose political manipulation and double standards in the approach to human rights.

Source: Forever Peace (1997), p. 54

Source: The Lonely Dead (2004), Ch. 14

1840s, Essays: First Series (1841), History
Context: The difference between men is in their principle of association. Some men classify objects by color and size and other accidents of appearance; others by intrinsic likeness, or by the relation of cause and effect. The progress of the intellect is to the clearer vision of causes, which neglects surface differences. To the poet, to the philosopher, to the saint, all things are friendly and sacred, all events profitable, all days holy, all men divine. For the eye is fastened on the life, and slights the circumstance. Every chemical substance, every plant, every animal in its growth, teaches the unity of cause, the variety of appearance.

Remarks at Human Rights Day event http://www.reagan.utexas.edu/archives/speeches/1986/121086a.htm (10 December 1986)
1980s, Second term of office (1985–1989)

Independent on Sunday, 9 June 1991

Source: The Golden Lily

[Sam Harris, 2 January 2006, http://www.huffingtonpost.com/sam-harris/science-must-destroy-reli_b_13153.html, "Science Must Destroy Religion", The Huffington Post, 2006-10-16]
2000s