This to Aquinas is theology. On the other hand, individuals are part of the natural order in the light of reason and thus can be examined through philosophy, i.e. observation. Neither can contradict each other because they both reveal truth of Being. Since the goal of both faith and knowledge is Being. Both are directed toward the truth of Being.
Reason is related to natural knowledge through empirical observances.
Faith deals with the revealed knowledge understood through feeling and will. Together they help one to comprehend what is now observable and what one day may be observable if permitted and not discounted. It is important not to discount the role of other monastic orders during the time of these questions. Most important was the adversarial role of the Franciscan Friars who as well were trying to make sense of the natural philosophy and alchemy occurring. The Franciscans practiced folk medicine to help heal the sick and prolong life.