John Wesley on Romans 2:1

Therefore - The apostle now makes a transition from the gentiles to the Jews, till, at Rom 2:6, he comprises both. Thou art inexcusable - Seeing knowledge without practice only increases guilt. O man - Having before spoken of the gentile in the third person, he addresses the Jew in the second person. But he calls him by a common appellation, as not acknowledging him to be a Jew. See verses Rom 2:17,28. Whosoever thou art that judgest - Censurest, condemnest. For in that thou judgest the other - The heathen. Thou condemnest thyself; for thou doest the same things - In effect; in many instances.