We are, for practical purposes, incarcerated on a prison planet. But, this does not mean that it is impossible to be happy or that we should spend our time in this world in quiet desperation, as Thoreau said.
This book is an action plan for us to make the best of what we have been given, achieving as much true happiness as possible in this life, understanding the meaning of our existence and, most important of all, realizing the meaning contained in eternity.