He said that "a dictatorship of relativism" was the core challenge facing the church and humanity. At the root of this problem, he said, is Kant's "self-limitation of reason". This, he said, is contradictory to the modern acclamation of science whose excellence is based on the power of reason to know the truth. He said that this self-amputation of reason leads to pathologies of religion such as terrorism and pathologies of science such as ecological disasters. Benedict traced the failed revolutions and violent ideologies of the 20th century to a conversion of partial points of view into absolute guides. He said "Absolutizing what is not absolute but relative is called totalitarianism."