 Motion does not take place in substantial change, that is, coming-to-be or passing-away because there is nothing contrary to substance (Phys. 225b10–11). Averroes comments on “contrary” and explains that the contraries here involved have “intermediate” states (mediata), no matter their form or condition (LC 215F TC10). Averroes refers to the commentaries of Alexander on De generatione et corruptione and Themistius without identifying the work which the latter comments, and their arguments, and he develops his point of view: Aristotle’s doctrine that changes in substance are not motion because substance has no contrary is well known (famosa) but it seems to him more adequate to say: 