The Incorruptibility of Motion

Motion. must necessarily always exist since time is a certain passion of motion the same reasoning likewise will prove that motion is incorruptible for as if it be admitted that motion was generated it will happen that there was a certain mutation prior to the first and again afterwards. A thing will not at the same time cease to be movable and to be moved or to be capable of being burnt and to be burnt but it will be requisite that what is capable of being corrupted should have been corrupted when it is corrupted and again afterwards. If therefore these things are impossible it is evident that motion is perpetual and not sometimes in existence and sometimes not.