Scholasticism did not know how to draw from its principles the physics which could and should flow from them. So our first duty today is to be more faithful to the demands of realism than the Middle-Ages were, and giving each order of reality its due. In each order, the reality of the form should be preserved, since without it one cannot account for structures, and it remains the principle of reality’s intelligibility. Etienne Gilson, Methodical Realism, 103
