He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.

However individuals are responsible for their own actions which they can examine and control through rigorous self-discipline. To Epictetus all external events are determined by fate and are thus beyond our control; we should accept whatever happens calmly and dispassionately. Philosophy Epictetus taught is a way of life and not just a theoretical discipline.