Veronica Roth said this quote

Every faction conditions its members to think and act a certain way. And most people do it. For most people, it's not hard to learn, to find a pattern of thought that works and stay that way. But our minds move in a dozen different directions. We can't be confined to one way of thinking, and that terrifies our leaders. It means we can't be controlled. And it means that no matter what they do, we will always cause trouble for them.