<p>2:15- see on Acts 23:6.</p><p><i>We being Jews by nature and not sinners of the Gentiles</i>- Paul is using here terms well known within Judaism, appealing to people, as we should, in their own terms and language. But Paul returns to allude to this term &quot;sinners&quot; in :17. There he reasons that if we seek to be justified by the Law whilst in Christ, then we shall be left unredeemed sinners. Thus, he reasons, you who are so defiantly Judaistic are declared sinners, and even worse than ignorant &quot;sinners of the Gentiles&quot;.</p>