How to Be Free: An Ancient Guide to the Stoic Life by A.A. Long is a new edition of Epictetus's Encheiridion, a celebrated guide to Stoic philosophy, along with some of Epictetus's Discourses. The book's central theme is freedom, which Epictetus, a former slave, defines as a mental orientation that is impervious to frustration or disappointment. According to Goodreads, the book's main ideas are that people can be free by...