This book is an invitation to start a journey to wake up. Many people live in reverie, in alienation, suffering for illusions that impede their self-realization. For yoga all part of the existence of a gross body by which, if we neglect, leads to inertia and self-destruction. While the subtle body makes us suffer and enjoy life. The causal body is an aspiration; the road is paved with the body of knowledge, which opens the door to free us from misfortune in being.