I cannot accept your canon that we are to judge Pope and King unlike other men, with a favourable presumption that they did no wrong. If there is any presumption it is the other way against holders of power, increasing as the power increases. Historic responsibility has to make up for the want of legal responsibility. All power tends to corrupt and absolute power corrupts absolutely. Great men are almost always bad men, even when they exercise influence and not authority: still more when you superadd the tendency or the certainty of corruption by authority. There is no worse heresy than that the office sanctifies the holder of it.
John Dalberg, Lord Acton (1834-1902) British historian, politician, writer
Letter (1887-04-05) to Mandell Creighton
(Source)
Often paraphrased, "Power corrupts, and absolute power corrupts absolutely."
There is an alternate, probably spurious version of this quote, for which I have been unable to find an actual citation (except where it is mis-cited to this letter to Bp. Creighton): "And remember, where you have a concentration of power in a few hands, all too frequently men with the mentality of gangsters get control. History has proven that. All power corrupts; absolute power corrupts absolutely." As the word "gangster" has only been traced back to 1886, and that in the US, its use by Acton (esp. in a modern sense) seems unlikely.
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