 Kilwardby begins his text in a clarifying manner of distinguishing between those sciences that are about human words and actions and those that are about what is divine (DOS 1; 654). The science of the divine is theology, focused on the study of the Sacred Scripture. Of the human sciences, some are commendable (philosophy), others vicious or illicit (magic). In DOS, Kilwardby is mostly concerned with the sciences of human invention. He further divides philosophy into speculative—the name that designates a group of sciences constituted by physics, mathematics, and metaphysics—and another group classified under the heading ‘about human things’, that is, the results of human intentionality (QLIS 90, 286); it includes the active sciences and the sciences of language. The former divides into mechanics and ethics, the latter into grammar, logic, and rhetoric. Mathematics includes the sciences of the quadrivium, that is, the four sciences of things as they were known in the Middle Ages (geometry, astronomy, music, and arithmetic).