Career
Jakub"s main work, entitled "Theoremata seu propositiones Auctoris Causarum", was a commentary to Liber de Causis attributed to the Greek philosopher Aristotle. He also wrote a commentary to Metaphysics by Aristotle entitled: "Expositiosuper I–XII libros „Metaphysicae” Aristotelis" as well as to his Physics. He contributed to commentaries by Paul of Venice (Paweł z Wenecji) to On the Soul (or "De Anima") by Aristotle and the theological works of January Versor.
Jakub of Gostynin is also the author of commentaries on the Gospel of John.
He donated his extensive library of manuscripts of philosophy, theology and language to the University of Krakow.
