The Motion of Time

In one way only can its motion subsist if time were composed from now's, since a thing would always be moved and changed in the now. But that this is impossible has been shown before. There is not any infinite mutation, for all mutation is from something into something. All change according to quality is from certain contraries. In like manner also this will be true of increase and diminution. Of those mutations which subsist according to contradiction, affirmation and negation are the boundary.