… I am certain that the greatest evils we know are not due to him who has to face himself again and whose curse is that he cannot forget. The greatest evildoers are those who don’t remember because they have never given thought to the matter, and, without remembrance, nothing can hold them back. For human beings, thinking of past matters means moving in the dimension of depth, striking roots and thus stabilizing themselves, so as not to be swept away by whatever may occur—the Zeitgeist or History or simple temptation. The greatest evil is not radical, it has no roots, and because it has no roots it has no limitations, it can go to unthinkable extremes and sweep over the whole world.

– Hannah Arendt. Responsibility and Judgment. Jerome Kohn, ed. New York: Random House, 2003.