Book 11
1
Now since the categories are distinguished as substance, quality, place, activity or passivity, relation and quantity,Aristotle generally distinguishes eight categories (originally ten, but he seems to have abandoned κεῖσθαιposition and ἔχεινstate at an early date); here he omits time as being relative to motion (it is that by which motion can be numerically estimated; cf. Aristot. Met. 12.6.2, Aristot. Phys. 219b 1) and therefore neither the subject nor the terminus of motion. Cf. Ross ad loc. there must be three kinds of motion, in respect of quality, quantity and place. There is no motionThere is, however, change in respect of substance (generation and destruction), but this is between contradictories and is not motion in the strict sense. Cf. Aristot. Met. 11.11.6, and sect. 4 below. The distinction between motion and change is not always maintained. in respect of substance, because substance has no contrary; nor of the relative, because it is possible that when one of two related things changes the relation to it of the other thing, even though the thing itself does not change, may become untrue; therefore the motion of these related things is accidental.
