 Based on the evidence of four propositions, Averroes realizes that motion does not have a univocal definition. Motion belongs to the genus of the perfection toward which it intends, thus motion in substance belongs to the genus of substance, motions in quantity, place and quality to the respective genera. But insofar as transition towards a perfection is different from the perfection itself, motion is something different from its goal and Averroes affirms that, considered in this way, “Motion must be a genus per se, for the way toward something is different from it [the end]”, necesse est ut sit genus per se, via enim ad rem est aliud ab ipsa re (LC 87D TC4). For this reason he believes, Aristotle classified motion in own category in his book on the Categories, and as we will see below, the category is being affected, passio.