The manuscript Kraków, Biblioteka Jagiellońska, rkp. 325 preserves an autograph redaction of the Principia in the Sentences commentary of Sigismundus de Pyzdry (†1428) which he presented at the University of Krakow in 1426–1428. A detailed analysis of the question in the first Principium reveals to us the composition process of these commentaries, a rare case which exposes the shaping of one’s doctrine on the scientific character of Theology, which starts by appropriating ideas and text parts from a previous commentary (i.e. the questions of Conradus de Soltau, who defended the ‘Augustinian’ tradition), and ends in the compulsory public debate by assuming an opposite position (i.e. a ‘Thomistic’ solution). A critical edition of this question accompanies this article.