For Ruiz, conquering fear is essential to reclaiming one’s own power. Ruiz uses the metaphor of a parasite that feeds off fear to describe the combination of the inner voices that judge, feel self-hatred, and agree to society’s belief system. Since Ruiz’s aim is to silence the voices and reject the internalized belief system, he argues that a person needs to destroy the parasite by ridding the mind of fear in some way, which is the fuel that keeps the parasite alive.