In this set, Luc Ferry tells how the greatest thinkers of antiquity, Plato, Aristotle or the Stoics, took over the legacy of Greek mythology to achieve a magnificent doctrine of wisdom, a secular spirituality that will cross centuries and who still speaks to us today. Essentially, it is a question of showing that the good life lies in the setting in harmony of oneself with the harmony of the world, this harmonious, just, beautiful and good cosmic order which forms in the eyes of the Ancients as a model to follow for the organization of the city. With the thought of Epicurus, sophists and atomists, we also see how a counter-culture, a "counter-philosophy" is being put in place, which already contests the idea of a harmonious cosmos and which, at once, proposes another conception of the good life.