There is not much to this chapter other than a reiteration of: it is not things that disturb me, but my judgement of those things.
In this chapter, he discusses the practical matters - when we complain how we suffer due to a parent, or sibling or boss or some external event.
We should not think or say that these things cause our suffering.
Rather, we should say, "Ah, how I suffer because of myself" (v. 2, p. 176).
We should always "blame ourselves for it and remember that nothing except our own judgement is capable of causing us to become disturbed or confused" and if we do this, then "we've made progress" (v. 3, p. 176).