— A Classic — Includes Active Table of Contents — Includes Religious Illustrations
There is a twofold operation of the intellect, as the Philosopher says in III De anima [6: 430a 26]. One is the understanding of simple objects, that is, the operation by which the intellect apprebends just the essence of a thing alone; the other is the operation of composing and dividing. There is also a third operation, that of reasoning, by which reason proceeds from what is known to the investigation of things that are unknown. The first of these operations is ordered to the second, for there cannot be composition and division unless things have already been apprehended simply. The second, in turn, is ordered to the third, for clearly we must proceed from some known truth to which the intellect assents in order to have certitude about something not yet known.