If then it is possible that at any time nothing should be in motion, this must come about in one of two ways: either in the manner described by Anaxagoras, who says that all things were together and at rest for an infinite period of time, and that then Mind introduced motion and separated them; or in the manner described by Empedocles, according to whom the universe is alternately in motion and at rest in motion, when Love is making the one out of many, or Strife is making many out of one, and at rest in the intermediate periods of time his account being as follows: