John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Christianity (1877)
John Emerich Edward Dalberg-Acton, 1st Baron Acton, 13th Marquess of Groppoli, , was an English Catholic historian, politician, and writer. He was the only son of Sir Ferdinand Dalberg-Acton, 7th Baronet, and a grandson of the Neapolitan admiral and prime minister Sir John Acton, 6th Baronet. Between 1837 and 1869 he was known as Sir John Dalberg-Acton, 8th Baronet.
He is perhaps best known for the remark, "Power tends to corrupt, and absolute power corrupts absolutely. Great men are almost always bad men...", which he made in a letter to an Anglican bishop. Wikipedia

John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Christianity (1877)
John Dalberg-Acton, 1st Baron Acton
"The Vatican Council," http://babel.hathitrust.org/cgi/pt?id=uc1.b3011302;view=1up;seq=187 The North British Review (1870)
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Christianity (1877)
John Dalberg-Acton, 1st Baron Acton
"Nationality" (1862)
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
p, 125
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
James Anthony Froude, in the lecture "The Science of History" (5 February 1864); published in Representative Essays (1885) by George Haven Putnam, p. 274; Lord Acton quoted Froude in an address "The Study of History" (11 June 1895) http://www.fordham.edu/halsall/mod/1906acton.html, which led to this being widely attributed to him. The phrase has also sometimes been misquoted as: Opinions alter, manners change, creeds rise and fall, but the moral laws are written on the table of eternity. <br class="br">Misattributed
John Dalberg-Acton, 1st Baron Acton
p, 125
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
p, 125
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
As quoted in Essays on Freedom and Power, Introduction, p. xlvii (1949) https://mises.org/sites/default/files/Essays%20on%20Freedom%20and%20Power_3.pdf
John Dalberg-Acton, 1st Baron Acton
"The Vatican Council," http://babel.hathitrust.org/cgi/pt?id=uc1.b3011302;view=1up;seq=187 The North British Review (1870)
John Dalberg-Acton, 1st Baron Acton
Forrás: The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
Introductory note to G.P. Gooch's Annals of Politics and Culture https://archive.org/stream/annalsofpolitics00goociala#page/n5/mode/2up, p. xxxlv (1901)
John Dalberg-Acton, 1st Baron Acton
p, 125
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
Letter (4 November 1866) http://www.lewrockwell.com/orig3/acton-lee.html to Robert E. Lee
John Dalberg-Acton, 1st Baron Acton
p, 125
The History of Freedom in Antiquity (1877)
John Dalberg-Acton, 1st Baron Acton
"Nationality" (1862)
John Dalberg-Acton, 1st Baron Acton
Letter (23 January 1861), published in Lord Acton and his Circle (1906) by Abbot Gasquet, Letter 74
John Dalberg-Acton, 1st Baron Acton
The Study of History (1895)
John Dalberg-Acton, 1st Baron Acton
As quoted in Maxed Out : Hard Times, Easy Credit, and the Era of Predatory Lenders (2007) by James D. Scurlock; The quote does not appear in any of Acton's published writings. Ezra Pound attributes the exact quotation to Sir Alexander James Cockburn, Lord Chief Justice of England in Pound, Ezra. "'Ezra Pound Speaking': Radio Speeches of World War II", ed. Leonard W. Doob (Westport: Greenwood Press, 1978), 219. https://archive.org/stream/EzraPoundSpeaking-RadioSpeechesOfWorldWarIi/EzraPoundSpeaking#page/n116/mode/1up/search/Lord+Chief+Justice
Misattributed
John Dalberg-Acton, 1st Baron Acton
The History of Freedom in Antiquity (1877)