In this book we do not talk religion. We speak of science, we talk about spirituality. If you spirituality is synonymous with religion, this book is not for you, or it will bring new meaning to the word. Certainly it is addressed in this book scientific concepts that require a level of culture or knowledge of at least bac, but neofite science will not be lost permanently and reflection over his reading will not necessarily disconnected from the content of this book. Mathieu Ricard brings the notion of a spirituality that speaks enormously surprising lighting has modern man. To illuminate these concepts is made of "parallel" between instructive scientific concepts, reasoning and spiritual and contemplative gait. No one has the impression of having lost his time, however, after reading this book.