Rhetoricians thrive on praise, which is vanity; philosophers love truth and embrace humility. Rhetoric is a form of entertainment, pleasant to hear; philosophy is a moral and psychological therapy, often painful to hear because it forces us to admit our own faults in order to remedy them—sometimes the truth hurts. Epictetus’s own teacher, the Stoic Musonius Rufus, used to tell his students, “If you have leisure to praise me, I am speaking to no purpose.” Hence, the philosopher’s school, said Epictetus, is a doctor’s clinic: you should not go there expecting pleasure but rather pain.