We have assumed and have proved that coming-to-be and passing-away happen to things continuously; and we assert that motion causes coming-to-be. That being so it is evident that if the motion be single both processes cannot occur since they are contrary to one another: for it is a law of nature that the same cause provided it remain in the same condition always produces the same effect so that from a single motion either coming-to-be or passing-away will always result. The movements must on the contrary be more than one and they must be contrasted with one another either by the sense of their motion or by its irregularity: for contrary effects demand contraries as their causes.