Epictetus goes through a number of titles people might take upon themselves; as he describes what makes that person consistent with the title. It reminds me a bit of what Marcus Aurelius said in Meditations 3.5: "let the god that is within you be the champion of the being you are - a male, mature in years, a statesman, a Roman, a ruler: one who has taken his post like a soldier waiting for the Retreat from life to sound, and ready to depart, past the need for any loyal oath or human witness."
The titles Epictetus reviews:
Citizen - "never to approach anything with a view to personal advantage, never to deliberate about anything as though detached from the whole" (v. 4, p. 90). His point is, that as a citizen (of a city, country and the universe), we ought to take a view of: what is beneficial for the whole is beneficial for the individual. The Stoics would go so far as to say "if a wise and good person could foresee the future, he would cooperate with nature even if it came to illness, death, or mutilation, because he would recognize that these are allotted as a contribution to the ordering of the whole, and that the whole is more important than the part, and the city than the citizen" (v. 7, p. 90).
Son - he discusses how as children we ought to obey our parents; never speak badly of them or say or do anything to harm them.
Brother - similarly, we should respect our siblings; do not contend with our siblings.
A council member - to counsel.
Youth, elderly, parent, smith - to show actions appropriate to the title.
The last part of the chapter talks about what we should do when someone injures us. "'What, then, if someone injures me, won't I injure him in return?'" (v. 24, p. 92). This is a question a student poses to Epictetus. Epictetus teaches "that the good lies in the choice" and that it makes just as much sense to turn the statement around: "'Since the person in question has injured himself by inflicting some wrong on me, shouldn't I injure myself by inflicting some wrong on him?" By flipping the perspective this way, it does not make sense to retaliate, since you are doing self-harm and it amounts to a double-dose of hurt.
It's a bit of an odd chapter, so hopefully you get something out of it.