“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 the holders of power, increasing as the power increases. Historic responsibility has to make up for the want of legal responsibility. Power tends to corrupt, and absolute power corrupts absolutely.”
John Emerich Edward Dalberg-Acton, 1st Baron Acton, KCVO, DL (10 January 1834 – 19 June 1902), in response to the introduction of the doctrine of papal infallibility.