'About things that are within our power and those that are not.' Epictetus' Discourses have been the most widely read and influential of all writings of Stoic philosophy, from antiquity onwards. They set out the core ethical principles of Stoicism in a form designed to help people put them into practice and to use them as a basis for leading a good human life. Epictetus was a teacher, and a freed slave, whose discourses have...