" Every society needs a cry like that, but only in a very few do they come out with the complete, unvarnished version, which is “Remember-The-Atrocity-Committed-Against-Us-Last-Time-That-Will-Excuse-The-Atrocity-That-We’re-About-To-Commit-Today! And So On! Hurrah! "

― Terry Pratchett , Thief of Time (Discworld, #26; Death, #5)