"God does not show favouritism." (Romans 2:11)
Having indicted the pagan world for its moral collapse in chapter 1, Paul turns in chapter 2 to those who pass judgment on others while doing the same things themselves. The argument is addressed first to a moralistic pagan but quickly becomes an address to the Jewish interlocutor who relies on the Law and boasts of a relationship with God. The logic is relentless: you who preach against stealing, do you steal? You who abhor idols, do you rob temples? Paul quotes Isaiah: God's name is blasphemed among the Gentiles because of you. The possession of the Law does not guarantee the doing of the Law.
The principle that governs the whole argument is stated simply and absolutely: God does not show favouritism. Jews and Gentiles are judged by the same standard. Those who sin apart from the Law will perish apart from the Law; those who sin under the Law will be judged by the Law. Paul even allows that Gentiles who do not have the Law can do by nature what the Law requires, showing that the requirements of the Law are written on their hearts, their conscience bearing witness. The Catechism identifies natural law precisely here: the participation of every rational creature in the eternal law of God, accessible to human reason even without divine revelation, which is why all people are morally accountable (CCC 1954).
Paul distinguishes the outward sign from the inward reality: a person is not a Jew who is one outwardly, nor is circumcision merely outward and physical. A person is a Jew who is one inwardly, and circumcision is circumcision of the heart, by the Spirit. This internalisation of the covenant sign prepares for his later argument that Abraham was justified by faith before he was circumcised, and that the true children of Abraham are those who share his faith. The Catechism connects the circumcision of the heart with Baptism, the new covenant sign that transforms the interior person by the action of the Spirit (CCC 527).
Brothers and sisters, God does not show favouritism. Neither should we in our judgments of others. Paul's warning against judging those who do what you do yourself is one of the most uncomfortable passages in Scripture because it names exactly what religious people are most prone to. Examine yourself before you examine others. The plank before the speck, as the Lord said. This is the consistent teaching of the New Testament and it begins here in Romans 2.
Lord God, you judge impartially and you see the heart. Circumcise our hearts by your Spirit so that our religion is not merely outward. Deliver us from judging others for what we practise ourselves. And give us the honesty to examine ourselves with the same rigour we apply to the world around us. Through Christ our Lord. Amen.