In the Enlightenment there was a revival of interest in logic as the basis of rational enquiry, and a number of texts, most successfully the Port-Royal Logic, polished Aristotelian term logic for pedagogy. During this period, while the logic certainly was based on that of Aristotle, Aristotle's writings themselves were less often the basis of study. There was a tendency in this period to regard the logical systems of the day to be complete, which in turn no doubt stifled innovation in this area. However Francis Bacon published his "Novum Organum" ("The New "Organon"") as a scathing attack in 1620. Immanuel Kant thought that there was nothing else to invent after the work of Aristotle, and the famous logic historian Karl von Prantl claimed that any logician who said anything new about logic was "confused, stupid or perverse." These examples illustrate the force of influence which Aristotle's works on logic had. Indeed, he had already become known by the Scholastics (medieval Christian scholars) as "The Philosopher", due to the influence he had upon medieval theology and philosophy. His influence continued into the Early Modern period and Organon was the basis of school philosophy even in the beginning of 18th century.