The Marquis de Sade is a famous writer of eroticism with erotic fantasies that overthrows interdicts and sarcasm of religions, morality and social systems. He had been through periods of monarchy, republicanism, terrorism governance, and imperialism and was greatly affected by the enlightenment as well as French Revolution, making his works of eroticism full of violence, contradiction and criticism in transgression thoughts.
Since middle of the twentieth century, many western famous authors, such as Roland Barthes, Michel Foucault, and Georges Bataille, have praised the literature value of Sade. They believe that Sade put the spirit of revolt of libertines into practice with the thoughts of the philosophy of evil, truly presenting the side of evil of human nature. However, there are rare critics mentioning the avant-garde thoughts in the works of Sade. Such a phenomenon reflects the realistic problem of contemporary religions, society and morality. The researcher, in textual analysis method, discusses how Sade, with the twisted and evil views of nature, in the dimensions of natural erotic feelings and natural evil, explores the limits of imagination and then crosses the border of interdicts to expound the transgression performance of the evil in religions, morality and social laws and regulations. Chapter One explains study motif, purposes and method with definitions of the evil and transgression. Chapter Two explores the relation of natural ontology and denial of theology of the evil and the worship of non-moral and anarchism. Chapter Three is the study of language of blasphemes in religions and self-contradictory denial theory of Sade. Chapter Four involves thoughts of morality, focusing on the philosophy of superman of libertines, the logical thinking difficult to be positioned between non-rationality and rationality.