In the period between the mid-12th and mid-13th centuries, the notion of 'science' replaced that of 'art' as the category against which all areas of academic inquiry including theology were measured. This dissertation selectively traces one aspect of this change as it is understood by Thomas Aquinas: the understanding of the relationship of sacred and secular study given these two different models of learning, art and science. ;Hugh of St. Victor's Didascalicon is discussed as it represents the acceptance and assimilation (...) of the 'arts' into a program of Christian education in the 12th century. The author reinterprets two Augustinian themes--the epistemological theory of divine illumination and the notion that theology is 'faith seeking understanding'--and uses them to explain and parallel the methods and order of learning for secular and sacred study. ;Next some of the thinkers and texts which introduce and try to interpret the notion of science, its requirements, and its application to the various disciplines are covered. Chapter two is dedicated to two didascalic works which use the Aristotelian concept of science and Aristotle's classification of sciences to divide and define the secular sciences, and chapter three deals with the understanding of the nature of science and its relationship to theology in William of Auvergne, Robert Grosseteste, and the Summa Fratris Alexandri. These thinkers both introduce the notion of science with which St. Thomas works and form the background against which Aquinas articulates his interpretation of science and the sciences. ;In conclusion, I turn to Aquinas' view of the subjects and methods of theology and the theoretical sciences, which he explains using the language of Aristotelian science rather than that of the arts. St. Thomas reinterprets the requirements for science given in the Posterior Analytics in a way that makes them applicable to theology, and in the process changes their application to the secular sciences, resulting in an understanding of the learning process that is symmetrical to the one found in the Didascalicon. The sciences are formed and defined not in terms of their objects, but in terms of their rationes or formal perspective, and the method of the sciences and sacred theology Aquinas articulates is, as it is for Hugh of St. Victor, circular or dialectical. ;As with Hugh of St. Victor, the standard for secular study, in Aquinas' case 'science' not 'art', redefines sacred study or theology, and at the same time, secular study is shown to share certain properties of sacred study, namely the circular or dialectical structure implied by 'faith seeking understanding'. (shrink)