I'm really pleased that Stoicism is seeing something of a resurgence. While Jack Dorsey and some other silicon valley types espousing it can be off-putting, there's a lot of value in Stoic ideas, and many of their practices anticipated or prefigured modern psychological practices (especially Cognitive-Behavioral therapy).
Would recommend Epictetus after a reader got through Seneca and Marcus Aurelius, especially if that reader was intrigued by their ideas. It's a surprisingly easy read for a classical text, and a lot of the humor and sarcasm still hits after 1900 years.
Two important tenants of Stoicism include (1) the world can be understood through reason- this presages science and the enlightenment. And (2) live life moderately, between wealth and frugality.
Would recommend Epictetus after a reader got through Seneca and Marcus Aurelius, especially if that reader was intrigued by their ideas. It's a surprisingly easy read for a classical text, and a lot of the humor and sarcasm still hits after 1900 years.