“The first line of Epictetus’ manual of ethical advice, the Enchiridion—“Some things are in our control and others not”—made me feel that a weight was being lifted off my chest. For Epictetus, the only thing we can totally control, and therefore the only thing we should ever worry about, is our own judgment about what is good. If we desire money, health, sex, or reputation, we will inevitably be unhappy. If we genuinely wish to avoid poverty, sickness, loneliness, and obscurity, we will live in constant anxiety and frustration. Of course, fear and desire are unavoidable. Everyone feels those flashes of dread or anticipation. Being a Stoic means interrogating those flashes: asking whether they apply to things outside your control and, if they do, being “ready with the reaction ‘Then it’s none of my concern.’””