The one who is content in the self has no duty left to gain anything and nothing to lose by stopping (3.17-18), yet is told to act well and without clinging (3.19).
The twenty verses give different reasons for not grieving, for different listeners, and they agree in outcome. One is the lasting self (2.16–25), one is the unavoidable cycle (2.26–28), and one is the self in every being (2.29–30).
Chapter 12 does not defeat any path: it says which road is easier for a person in a body, gives four steps by capacity, and makes conduct the proof of devotion (12.1-20).