Wherefore I take pleasure (dio eudokō). For this noble word see note on Mat 3:17 and note on 2Co 5:8. The enemies of Paul will have a hard time now in making Paul unhappy by persecutions even unto death (Phi 1:20-26). He is not courting martyrdom, but he does not fear it or anything that is “for Christ’s sake” (huper Christou).
For when (hotan gar). “For whenever,” indefinite time.
Then I am strong (tote dunatos eimi). At that very time, but not in myself, but in the fresh access of power from Christ for the emergency.