The phrase "once for all" means to finish something completely. The full meaning of this can be made explicit. AT: "For when he died he broke the power of sin completely" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-explicit]])
Here "sin" refers to the power that lives within us and makes us want to sin. AT: "dead to the power of sin" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The phrases “on the one hand” and “on the other hand” introduce two different ways of thinking about something. AT: "dead to sin but also alive to God"