The Doubt of Motion

It is necessary either that those things which are moved should always be moved or that some things should be moved and others be at rest. The doubt likewise is about a certain whole and not about a part nor is it only adverse to the natural philosopher but likewise to all the sciences as I may say, because they use motion again. no sensitive motion being inherent though a certain motion is inherent animals are again excited these things however will be manifest from what follows chapter three.