Paul is speaking to fellow Jewish Christians, highlighting their shared heritage and the traditional view of Gentiles as 'sinners' due to their lack of adherence to Jewish law. This statement reflects the historical context where Jews were seen as God's chosen people, distinct from Gentiles. However, Paul's intention is not to perpetuate division but to prepare for a profound theological point: that both Jews and Gentiles are justified through faith in Jesus Christ, not by the works of the law.
This verse is part of a larger argument where Paul is challenging the notion that adherence to the Jewish law is necessary for salvation. By emphasizing faith over law, Paul is advocating for a new understanding of righteousness that is accessible to all, regardless of their ethnic or religious background. This message is central to the Christian doctrine of justification by faith, which asserts that salvation is a gift from God, not something earned by human effort. It invites believers to embrace a faith that unites rather than divides, emphasizing grace and the transformative power of Christ's love.