Strange book, patchwork of diplomatic and historical anecdotes, reports of experiences sociology or psychology, literary quotations and forays into general relativity. I confess to have found it quite confusing journey through his first chapters, the subject dealt with justly ... .Can be confusion was this the will of the author. The fact remains that later, reading the book is really pleasant, perhaps because a thread seems to maintain some cohesion between the many areas addressed: the paradox. Those looking for a practical manual for achieving an absolute truth, supreme reality, will be for their expenses. However, those who are not afraid of the doubt close again work with the pleasant impression to learn a little more about the strange world where they live.