The Apostle Paul
Romans 2:14ESV·traditional attribution

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.

John Calvin Reformed @genevareformer

14. For when the Gentiles, etc. He now states what proves the former clause; for he did not think it enough to condemn us by mere assertion, and only to pronounce on us the just judgment of God; but he proceeds to prove this by reasons, in order to excite us to a greater desire for Christ, and to a greater love towards him.

Matthew Henry Presbyterian @wholebiblehenry

In the former chapter the apostle had represented the state of the Gentile world to be as bad and black as the Jews were ready enough to pronounce it. And now, designing to show that the state of the Jews was very bad too, and their sin in many respects more aggravated, to prepare his way he sets himself in this part of the chapter...

Commenting on Romans 2:1-16

John Gill Reformed Baptist @doctorgill

In the day when God shall judge,.... These words are to be read in connection with Rom 2:13, and express the time when both Jews and Gentiles will be judged, called a "day", both because of the clearness and evidence of the judgment that will be made, and because a certain time is fixed, though not known, which will surely come; also the matter of...