HOW CAN THE SOUL REMAIN IMPASSIBLE, THOUGH GIVEN UP TO EMOTION?

How could that part of the soul that is superior to sensation and passion remain unalterable, while admitting vice, false opinions, and ignorance (or folly); when it has desires or aversions; when it yields itself to joy or pain, to hate, jealousy, and appetite; when, in one word, it never remains calm, but when all the things that happen to it agitate it, and produce changes within it?