A Sermon on Romans 2:13-15
For it is not the hearers of the law who are righteous before God, but the doers of the law who will be justified. For when Gentiles, who do not have the law, by nature do what the law requires, they are a law to themselves, even though they do not have the law. They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them (ESV)
God's standards; both Jews and Gentiles condemned; objections about 'righteous' people; 'noble' philosophers and 'good' pagans; application to the Jews in terms of their failure to act according to their knowledge.