The Commentary of Conrad of Prussia on the ‘De ente et essentia’ of St. Thomas Aquinas [Book Review]

The way in which early followers of St. Thomas Aquinas interpreted or misinterpreted his metaphysical doctrines and works still needs much exploration, so a text edition and editor’s commentary of this kind is a most welcomed project, especially since Conrad of Prussia has possibly left us the earliest commentary on Aquinas’ De ente et essentia. The editing task is a precarious work, however, since Conrad’s commentary survives in only one known manuscript, located in the monastery library at Admont, Austria. The editors’ printed result thus has a number of flaws, but without a copy of the codex it is impossible to say which derive from the manuscript and which from the editors. Without a text a reviewer cannot legitimately correct, but can only suggest alternatives to evident mistakes. In the first lectio there is a very humorous flaw. Conrad is trying to prove that little mistakes can sometimes lead to big ones. The edited text illustrates: "omnis canis creditur, celeste sydus est canis, ergo celeste sidus creditur. Interum: quidquid creditur, habet pedes; celeste sydus, ut dictum est, creditur; ergo habet pedes. Ecce quot inconvenientia sequuntur ex uno modico errore." Creditur makes no sense: "Every dog is believed."? Currit does make sense: "Every dog runs." Unwittingly the editors prove the point the author wanted to make. By misreading or failing to correct the fundamental word currit so frequently it grew into a big error. It grew into an even bigger one later because Professor Bobik’s commentary on this text is an explanation based on this faulty text.