“I exhort you never to debase the moral currency or to lower the standard of rectitude, but to try others by the final maxim that governs your own lives, and to suffer no man and no cause to escape the undying penalty which history has the power to inflict on wrong.”

Postscript of letter to Mandell Creighton (5 April 1887), puplished in Historical Essays and Studies, by John Emerich Edward Dalberg-Acton (1907), edited by John Neville Figgis and Reginald Vere Laurence, Appendix, p. 505 http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=2201&chapter=203934&layout=html&Itemid=27
Context: ADVICE TO PERSONS ABOUT TO WRITE HISTORY — DON’T
In the Moral Sciences Prejudice is Dishonesty.
A Historian has to fight against temptations special to his mode of life, temptations from Country, Class, Church, College, Party, Authority of talents, solicitation of friends.
The most respectable of these influences are the most dangerous.
The historian who neglects to root them out is exactly like a juror who votes according to his personal likes or dislikes.
In judging men and things Ethics go before Dogma, Politics or Nationality. The Ethics of History cannot be denominational.
Judge not according to the orthodox standard of a system religious, philosophical, political, but according as things promote, or fail to promote the delicacy, integrity, and authority of Conscience.
Put conscience above both system and success.
History provides neither compensation for suffering nor penalties for wrong.

December 8, 2010, video posting — www.kgun9.com, 9OYS Investigates: Who is Jared Loughner?, KGUN9, January 8, 2011, 2011-01-10 http://www.kgun9.com/Global/story.asp?S=13809065,

Hays translation
Source: Meditations (c. AD 121–180), Book VII, 71

Letter to Benjamin Vaughan https://books.google.de/books?id=d3UPAAAAQAAJ&pg=PA166&dq=maxim, on Blackstone's Ratio (14 March 1785).
Epistles

This Business of Living (1935-1950)

Open letter to the Masters of Dublin (1913)

"Likeness to God", an address in Providence, Rhode Island (1828)
Context: I see the marks of God in the heavens and the earth, but how much more in a liberal intellect, in magnanimity, in unconquerable rectitude, in a philanthropy which forgives every wrong, and which never despairs of the cause of Christ and human virtue. I do and I must reverence human nature... I thank God that my own lot is bound up with that of the human race.

The Never-Ending Wrong (1977)
Context: Far away and long ago, I read Emma Goldman's story of her life, her first book in which she told the grim, deeply touching narrative of her young life during which she worked in a scrubby sweatshop making corsets by the bundle. At the same time, I was reading Prince Kropotkin's memoirs, his account of the long step he took from his early princely living to his membership in the union of the outcast, the poor, the depressed, and it was a most marvelous thing to have two splendid, courageous, really noble human beings speaking together, telling the same tale. It was like a duet of two great voices telling a tragic story. I believed in both of them at once. The two of them joined together left me no answerable argument; their dream was a grand one but it was exactly that — a dream. They both lived to know this and I learned it from them, but it has not changed my love for them or my lifelong sympathy for the cause to which they devoted their lives — to ameliorate the anguish that human beings inflict on each other — the never-ending wrong, forever incurable.