Coming at a difficult period (a toxic work climate and the passing of a beloved family member), I read this slowly. It is exactly the sort of consolation one might want from a collection of Stoic writings. How to deal with bad influences, grief, old age, and illness. How to appreciate friends.
Because he mostly writes these letters from a sort of pastoral exile (at one point, from the house that once belonged to Scipio Africanus), it also reinvigorated my own fantasies of a wealthy, rural exile.
In a more academic sense, it does not necessarily delve too deeply into things like Stoic atomism and not at all (except by noting it exists) Stoic logic (for which, I gather, they were most famous; I haven’t read any of the school’s treatises on logic but I gather they are mostly concerned with “and” and “or” statements).