Power tends to corrupt, and absolute power corrupts absolutely.
John Emerich Edward Dalberg-Acton, 1st Baron Acton, 13th Marquess of Groppoli, better known as Lord Acton, 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.
Great men are are almost always bad men, even when they exercise influence and not authority.
There is no worse heresy than that the office sanctifies the holder of it.