Opens you up to a deeper understanding of human psychology, and on how we are guided by our emotions and our moods and we choose to look for evidence to support the things we believe in. It opens your mind up to rational thinking and how to interpret and react to others who might portray different traits and behavior. Well researched and well written book. Especially loved these lines - "In his conception, the human mind has to worship something, has to have its attention directed to something it values above all else. For most people, it is their ego; for some it is their family, their clan, their god, or their nation."