The Enchiridion by Epictetus

Epictetus (Greek: Επίκτητος; c.55–c.135) was a Greek Stoic philosopher. The name given by his parents, if one was given, is not known – the word epiktetos in Greek simply means “acquired.” Epictetus spent his youth as a slave in Rome to Epaphroditos, a very wealthy freedman of Nero. Even as a slave, Epictetus used his time productively, studying Stoic Philosophy under Musonius Rufus. He was eventually freed and lived a relatively hard life in ill health in Rome. So far as is known, Epictetus