The title, as well as the hero of the book, concerns the reader himself /herself as witness to his / her own life, who is called on, throughimplementing the same techniques of self-awareness and self-controltaught in it-recapitulation, the monitor of conscience, testimony, themonitor of behaviour, meditation, writing, reading, reflection on death, careful listening, silence-, to reach knowledge itself and the same or evendeeper conclusions.This book wants to push the reader into the little room of his or her self, where, with sincere introspection and by consciously breathing in theimages of life's experiences, he or she will manage to acquire, as a prize, the understanding that is necessary to align himself with the world, whichis always the second interlocutor, for the benefit of both parties: himselfand the world.Becoming happy or sad requires the same amount of energy. What changesis the direction. The world is primarily energy, and then an object and, onlyif we view it as such, will we manage to take part in its perennialtransformations, flowing with it and changing, while we remain the same, for it is us alone that ring these cha