Above all, mental harmony is important for an individual because it allows for greater mental stability. Socrates believes that "to produce health is to establish the natural elements of a body in the natural relation of being dominated and dominated by one another, while to cause disease...(is to be) contrary to the nature” (Plato, Republic, 444c-d). So, not only is mental harmony important for everyone's peace of mind and personal growth, but it is also necessary for living a healthy and fulfilling life.