Book excerpt: Reading innumerable treatises on demonology written during the Renaissance, including Thesaurus exorcismorum, the most important record of early modern exorcisms, Maggi finds repeated attempts to define the language exchanged between the fallen progeny of Adam, and the most notorious fallen angel of them all, Satan. Using points of departure taken from de Certeau and Lacan, Maggi shows that Satan articulates his language first and foremost in the mind. More than speaking, the devil tries to make human beings understand his language and speak it themselves.