The epitomy of everything wrong with us. Quintesscentially our greatest weakness, and our greatest motivator. It throws us into fits of unexplainable behaviors, and indefinable inactions. The source of paranoia, high-anxiety and psychosis. It controls us, sometimes to the point of capitulation, and there we sit, and never know the the triumph of success, nor the knowlege gained from failed attempts.
Everything we ever wanted is just on the other side of fear.