Generally speaking, the conception of man’s divinely mediated salvation, and of the elements of human being which might be carried on, and realized in a state of everlasting beatitude, prescribed the range of ultimate intellectual interests for the Middle Ages. The same had been despotically true of the patristic period. Augustine would know God and the soul; Ambrose expressed equally emphatic views upon the vanity of all knowledge that did not contribute to an understanding of the Christian Faith. This view was held with temperamental and barbarizing narrowness by Gregory the Great. It was admitted, as of course, throughout the Carolingian period, although humanistically-minded men played with the pagan literature. Nor was it seriously disputed in the eleventh or twelfth century, when men began to delight in dialectic, and some cared for pagan literature; nor yet in the thirteenth when an increasing number were asking many things from philosophy and natural knowledge, which had but distant bearing on the soul’s salvation. One of these men was Roger Bacon, whose scientific studies were pursued with ceaseless energy. But he could also state emphatically the principle of the worthlessness of whatever does not help men to understand the divine truths by which they are saved. In Bacon’s time, the love of knowledge was enlarging its compass, while, really or nominally as the individual case might be, the criterion of relevancy to the Faith still obtained, and set the topics with which men should occupy themselves. All matters of philosophy or natural science had to relate themselves to the _summum bonum_ of salvation in order to possess ultimate human interest. Therefore, if philosophy was to preserve the strongest reason for its existence, it had to remain the handmaid of theology. Still, to be sure, the conception of man’s beatitude would become more comprehensive with the expansion and variegation of the desire for knowledge.