"For the Greater Good" is a phrase that Gellert Grindelwald used to justify his horrific actions in the 1940s global wizarding war and it was engraved over the entrance of Nurmengard, the prison he constructed to house those who opposed him. It expressed his belief that what he was doing was to be of eventual benefit to everyone, but that a small number of people would have to suffer to bring these benefits about. --http://harrypotter.wikia.com/wiki/For_the_Greater_Good

—One of Albus Dumbledore's letters to Gellert Grindelwald in their school years as they plotted Muggle domination. (ГП и ДС)