“I regard the Honourable member for Randburg as a friend. I regard him as a person who has done tremendous work as treasurer of the United Party on the Witswatersrand branch. The test of friendship comes in what you do as a man in adversity. I want to say, and I make so secret of it, that I am my brother's keeper and I will not be his executioner.”

Genesis 4:9.
Tyndale's translations

The Clerk's Vision (1949)
Context: The world stretches out before me, the vast world of the big, the little, and the medium. Universe of kings and presidents and jailors, of mandarins and pariahs and liberators and liberated, of judges and witnesses and the condemned: stars of the first, second, third and nth magnitudes, planets, comets, bodies errant and eccentric or routine and domesticated by the laws of gravity, the subtle laws of falling, all keeping step, all turning slowly or rapidly around a void. Where they claim the central sun lies, the solar being, the hot beam made out of every human gaze, there is nothing but a hole and less than a hole: the eye of a dead fish, the giddy cavity of the eye that falls into itself and looks at itself without seeing. There is nothing with which to fill the hollow center of the whirlwind. The springs are smashed, the foundations collapsed, the visible or invisible bonds that joined one star to another, one body to another, one man to another, are nothing but a tangle of wires and thorns, a jungle of claws and teeth that twist us and chew us and spit us out and chew us again. No one hangs himself by the rope of a physical law. The equations fall tirelessly into themselves.
And in regard to the present matter, if the present matters: I do not belong to the masters. I don't wash my hands of it, but I am not a judge, nor a witness for the prosecution, nor an executioner. I do not torture, interrogate, or suffer interrogation. I do not loudly plead for leniency, nor wish to save myself or anyone else. And for all that I don't do and for all that they do to us, I neither ask forgiveness nor forgive. Their piety is as abject as their justice. Am I innocent? I'm guilty. Am I guilty? I'm innocent. (I'm innocent when I'm guilty, guilty when I'm innocent. I'm guilty when … but that is another song. Another song? It's all the same song.) Guilty innocent, innocent guilty, the fact is I quit.

Gordon Humphrey

Letter to Archbishop of Canterbury (14 October 1940), quoted in Keith Feiling, Neville Chamberlain (London: Macmillan, 1946), p. 455.
Post-Prime Ministerial

The Issue (1908)
Context: Now my friends, I am opposed to the system of society in which we live today, not because I lack the natural equipment to do for myself, but because I am not satisfied to make myself comfortable knowing that there are thousands of my fellow men who suffer for the barest necessities of life. We were taught under the old ethic that man's business on this earth was to look out for himself. That was the ethic of the jungle; the ethic of the wild beast. Take care of yourself, no matter what may become of your fellow man. Thousands of years ago the question was asked: "Am I my brother's keeper?" That question has never yet been answered in a way that is satisfactory to civilized society.
Yes, I am my brother's keeper. I am under a moral obligation to him that is inspired, not by any maudlin sentimentality, but by the higher duty I owe to myself. What would you think of me if I were capable of seating myself at a table and gorging myself with food and saw about me the children of my fellow beings starving to death?

DNb inscription http://www.livius.org/aa-ac/achaemenians/DNb.html

29d–30a
Plato, Apology

1910s, The New Nationalism (1910)