The authors use the frame of the 6 realms of existence, or the 6 paths of rebirth, to explain the various ways humans deceive themselves about their true nature. Each of these deceptions causes suffering, and the authors hope that by naming and defining these deceptions we can break free of their dominion.
If only it were so easy.
Yet the authors know that enlightenment isn't easy. Our true nature is like a dance: though difficult to learn, and thus needing to be taught, there is something effortless about it which transcends instruction. It is this spirit of effortlessness, of ease, of lack of tension, and of direct perception of some kind of spirit, that the authors try to impart through their many observations of a frustrated humankind.
God-realm emotions are defined by blissed-out self-satisfaction. People in this realm are consumed by pleasure until they grow indifferent to the suffering of others. Focussing on pleasure and bliss also robs them of the ability to experience themselves as multidimensional beings. In serving themselves, they grow numb to both themselves and others.
Titan-realm emotions are defined by an obsession with success. Titans want power, yet they suffer from feelings of inferiority, jealousy, and envy when they compete against each other. They constantly struggle to overcome an unfair world, all the while robbing themselves of the joys of a gentle coexistence with other people. Titans feel pleasure but not peace.
Human-realm emotions strive to impose an arbitrary order on a chaotic universe. They name things, categorise them, and turn them into concepts in an attempt to "make sense" of the world--that is, they force the world to make sense on their terms. This attempt to transform the universe into something that is clear and definite is central both to the process of enlightenment as well as to the process of fabulation, whereby humans construct fantasy-worlds that are comforting because they're easy to understand. Humans make things up in order to feel good, even if those made up things are wrong.
Hungry-ghost-realm emotions feel incomplete. Hungry ghosts feel like their life is missing something which, if they possessed it, would make them happy. They compare themselves to others and always find themselves lacking. Eventually, the constancy of this sense of lack becomes a kind of shield: hungry-ghosts identify with their sense of failure and transform it into the one thing they can rely on. Like two people in self-destructive co-dependent love, hungry-ghosts crave an end to their suffering but treasure the thing that hurts them.
Hell-realm emotions see themselves as victims. Identities are formed around hatred, frustration, guilt, and blame, and the bearers of these identities feel constantly persecuted. Other people--their bad intentions, their malice, their cruelty--and the world at large--its corruption, violence, normlessness--seem always to be at one's throat. People who live in the hell realm struggle to free themselves from their emotions because they feel that doing so means freeing the entire world; their struggle reflects the world struggle, so their thoughts, behaviours, and actions are justified. People in the hell realm hate their lives, but cannot admit that they're the problem.
Animal realm emotions are focussed on survival. Unlike in the hell realm, there is not even the suspicion of persecution: fear is primal, and any intrusion into the orderliness of their lives is suspect. Disaster lurks everywhere, and animal-realm emotions seek healing the way a dying cat seeks solitude. They just want to be left alone. Animals live in a universe of one, and perceive all the world as unfathomable chaos.