It is, in reality, two lectures at the Sorbonne, the same day, one of Lucien Jerphagnon "Why Christianity? the Roman point of view ", the other of Luc Ferry:" Why the victory of Christianity over Greek philosophy? ". The first, shorter, is interesting; the second is of a height and a beautiful clarity. Luc Ferry decrypts with ease both the progress of the Greek scheduling, typified by the passage of the attitude in the Iliad with the approach in the Odyssey as the stoicism to the revolution of Christianity. Indispensable to understand, acquire, think. One reads it in stride ... Congratulations. To better understand, it is imperative to read the Advancement of God in the Book of Acts of the Apostles, by far the best book on the Acts of the Apostles and the birth of Christianity. This is however not a compilation, it is innovative, easy to read, and quite exciting. Above all, he says what is never discussed but fully illuminates the New Testament. The must!