Where do we come from, who are we, where are we going? Answering those three famous questions seems impossible but, surprisingly, it is convergent with the scientists' search for the theory of everything and their endeavor to one day find a Holy Grail that will answer our main questions. This book tries to find out if there is such a philosopher's stone that governs the totality of existence. With an informative and attractive language, and at the same time rigorous as a good economist, the wise humanist, Ramón Tamames, searches for God in the universe. For the existence of a principle responsible for all evolution seems to be supported by science, according to the testimonies of many of the leading scientists of the twentieth century to whom Tamames refers in this work.