“Dum maledicit impius diabolum, maledicit ipse animam suam.”
While the ungodly, &c. He condemneth and curseth himself; inasmuch as by sin he takes part with the devil, and is, as it were, his member and subject. (Challoner) — In vain does he lay the blame of his sins on the devil, ver. 3. (Calmet) — He condemns himself by imitating the wicked, Luke xix. (Worthington)