This style of examining intellectual questions was common in all the disciplines that were taught in the medieval university and was particularly important in the development of law, theology, natural philosophy (that is, those studies concerned with matter and the physical world), and medicine. Philosophy itself was not an independent discipline in the medieval university, as it is today, although its methods of rational analysis and its logic pervaded all studies. Much of what we would identify today as “philosophy” was concerned with theological issues, although in every area of academic endeavor, medieval scholars wrote works that were philosophical in nature. The importance of philosophy in the medieval curriculum, especially in theological studies, had grown during the course of the high Middle Ages (the eleventh to the thirteenth centuries). In the eleventh century, for instance, many of those who taught in Europe’s cathedral schools had been wary of the use of ancient Instruction at the University of Paris in the later Middle Ages. philosophy within theological studies, but over time the rational and logical analysis that philosophy offered influenced theological study more and more. In the twelfth century Peter Abelard (1079–1142) compiled his Sic et non , a work that presented the conflicting statements of the scriptures and of early church fathers concerning doctrinal issues. Although Abelard was a Platonist as were many scholastics of his day, he relied on Aristotle 's dialectical method as a means to analyze and harmonize contradictory statements. Peter Lombard (c. 1100–c. 1160) built upon his efforts to construct his Sentences, a work that examined the sum of the church’s theology, and which attempted to harmonize the contradictory statements of the ancient church fathers concerning the key teachings of Christianity . In many cases, however, Lombard’s Sentences left the contradictions that existed between early Christian authorities unresolved, and thus his work became an important textbook for those theological students who followed him. Students were expected to weigh the contradictory statements of ancient church authorities and the Scriptures the Sentences contained, and to construct their own theological judgments by confronting and harmonizing those contradictions through reasoned and logical analysis. As the Sentences became more popular the dialectical method of Aristotle and the teachings of ancient philosophy concerning the science of logic became increasingly important to European theologians , many of whom wrote commentaries on Lombard’s work. By the thirteenth century, in fact, logic had a pre-eminent position in the theological curriculum of universities throughout Europe.