Power corrupts, absolute power corrupts absolutely. Winston S Curchill.

At the risk of thread drift - quotes attributed to Churchill are like songs that become Irish, no matter what their origin.

According to multiple sources on the Internet, including this one, the quote most often used is from a letter written by Lord Acton in 1887. Even then, the idea wasn't original. Something similar had been used several times before then, most notably by William Pitt the Elder in 1770.

DC