Stoicism, ancient Rome's most popular philosophy, posited that virtue is the only human good and that individuals must detach themselves emotionally from the material world in order to live ethical lives. Principles of Stoic philosophy will be explored together with the wide array of artistic, political, and intellectual traditions that have drawn inspiration from it, from the Haitian revolutionary movement of the late 18th century, to the sexist "manosphere" of Reddit and Twitter, to modern cognitive-behavioral therapy.