MASHA GESSEN
The Future Is History: How Totalitarianism Reclaimed Russia

It was the oldest trick in the book - a constant state of low-level dread made people easy to control, because it robbed them of the sense that they could control anything themselves. This was not the sort of anxiety that moved people to action and accomplishment. This was the sort of anxiety that exceeded human capacity. ... You can no longer sit still or reason. You regress, and after a while the only thing you can do is scream, like a helpless terrified baby. you need an adult, a figure of authority. Almost anyone willing to take charge will do. And then, if that someone wants to remain in charge, he will have to make sure that you continue to feel helpless.

MASHA GESSEN
The Future Is History: How Totalitarianism Reclaimed Russia

Arendt pointed out that both the Nazi and the Soviet regimes conducted periodic purges or crackdowns, which she called "an instrument of permanent instability." Constant flux was necessary for the system's survival: 'The totalitarian ruler must, at any price, prevent normalization from reaching the point where a new way of life could develop - one which might, after a time, lose its bastard qualities and take its place among the widely differing and profoundly contrasting ways of life of the nations of the earth." Indeed, she wrote, 'The point is that both Hitler and Stalin held out promises of stability in order to hide their intention of creating a state of permanent instability."