Fear is an emotion we've all experienced, and one we all want to get under control. Whether you spend your free time watching reality TV or listening to self-help videos from the 80s, you know that fear limits your ability to reach your true potential.
In Delirium, fear sure limits Lena. Maybe the government in this book would have made a productive society if they had outlawed fear instead of love. However, fear is how this government works.
It instills a fear of love, of companionship, of success into its people, which isolates them and makes them easier to control. It is only when she acknowledges her feeling of love—her relationship with Alex—and her ability to do things without falling over, that Lena finally starts to overcome her fear.