These verses provide a summary of Paul’s claims thus far, carefully considering the implication of each point. Paul achieves this slower pace by using rhetorical questions. After all, saying, “Boasting is excluded by the law of faith,” would have been much easier. Asking questions also allows wrong alternatives—like the law of works—to be considered. It’s the proverbial speak slowly and use small words to make sure no one misses important points and how they intertwine.