Paul uses this question to explain why the answer is easy to understand. AT: "Since...the service of the Spirit will be even more glorious." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Paul uses the phrase "service of" to refer to the way God provided for us to get either spiritual death by the law, or eternal life by the Spirit. AT: "the way provided to get death...the way provided to get the Spirit" (See: [[rc://en/ta/man/translate/figs-metaphor]])