 This influence is most clearly seen in the sixth and final 1863 edition of the book, which is decorated with many engravings and seeks to affirm the existence of the demons.de Plancy collaborated with Jacques Paul Migne, a French priest, to complete a "Dictionary of the occult sciences or theological Encyclopaedia", which is described as an authentic Roman Catholic work.Many articles written in the "Dictionnaire Infernal" illustrate the author's vacillation between rationalism, faith, and willingness to believe without evidence.