He who has lent to the mathematical aridity of the "ethics" of Baruch Spinoza will marvel of the infinite sweetness of the work of Irvin Yalom. This extraordinary storyteller evokes here the story of a man who dared to set out community, non-family, non-standard 'He dared to defy the religions in his time and learned to accommodate the laws of nature as essential, to Step outside any dogma. This story, Irvin Yalom connects to another, lived several centuries later, in the person of "theoretician" of the Nazi Party, Alfred Rosenberg. While his psychiatrist talent is expressed here to describe the inside how the work of Spinoza has influenced the world, contribute to the advent of the Enlightenment, but also be particularly active, disturbing, exploited at deep within this individual, in the saddest moments in the history of mankind, the dark days of the Holocaust. I. Yalom takes us with him on the way these men in reflection to try to understand the human itself, its place in the universe, also understand what may turn into violence and heresy 'and all the possible excesses, extremism and even the 'unacceptable. The immanence and transcendence, in their eternal dance draw very strange fluctuations in the earth of men ' And for the pleasure to read these words "The free man thinks of nothing less than of death, and his wisdom is a meditation not of death but of life." Ethics.