Continuing a research and a reflection on the dialectic between the sacred and the power begun seven years before with "The sacrament of power", Paolo Prodi in his new book makes an ambitious analysis, wide-ranging, of one of the pillars of the Western civilization: the coexistence of different "justices", in other words the separation between legal and moral norms, between crime and sin, which has made ​​possible that kind of justice of freedoms and guarantees typical of our civilization.