At the end of chapter 1, Paul made a list of ways that people fail to honor God: everything from sexual sins to disobeying parents. This is a pretty wide range, and we would certainly treat those two things very differently. But now he brings that list into a different light: we are all sinners before God, equally broken. We cannot judge, we must leave that work to God. He also brings his Jewish upbringing into the picture as well, pointing out that both Jew and Gentile find condemnation and redemption. It’s an attempt at unity that we might be wise to mimic.