And who can never be hindered? The man who sets his desire on nothing that is not his own. And what are those things that are not our own? Those that are not in our power, either to have or not to have, or to have them of a particular nature, or under specific conditions. Our body, therefore, is not our own, its parts are not our own, and our property is not our own. So if you become attached to any of these as your own, you will be punished, as he deserves to be who sets his desire on what is not his own.

~ Epictetus