12 If you sin without knowing what you're doing, God takes that into account. But if you sin knowing full well what you're doing, that's a different story entirely. 13 Merely hearing God's law is a waste of your time if you don't do what he commands. Doing, not hearing, is what makes the difference with God. 14 When outsiders who have never heard of God's law follow it more or less by instinct, they confirm its truth by their obedience. 15 They show that God's law is not something alien, imposed on us from without, but woven into the very fabric of our creation. There is something deep within them that echoes God's yes and no, right and wrong.
Matthew Henry's Commentary on Romans 2:12-15
Commentary on Romans 2:1-16
(Read Romans 2:1-16)
The Jews thought themselves a holy people, entitled to their privileges by right, while they were unthankful, rebellious, and unrighteous. But all who act thus, of every nation, age, and description, must be reminded that the judgment of God will be according to their real character. The case is so plain, that we may appeal to the sinner's own thoughts. In every wilful sin, there is contempt of the goodness of God. And though the branches of man's disobedience are very various, all spring from the same root. But in true repentance, there must be hatred of former sinfulness, from a change wrought in the state of the mind, which disposes it to choose the good and to refuse the evil. It shows also a sense of inward wretchedness. Such is the great change wrought in repentance, it is conversion, and is needed by every human being. The ruin of sinners is their walking after a hard and impenitent heart. Their sinful doings are expressed by the strong words, "treasuring up wrath." In the description of the just man, notice the full demand of the law. It demands that the motives shall be pure, and rejects all actions from earthly ambition or ends. In the description of the unrighteous, contention is held forth as the principle of all evil. The human will is in a state of enmity against God. Even Gentiles, who had not the written law, had that within, which directed them what to do by the light of nature. Conscience is a witness, and first or last will bear witness. As they nature. Conscience is a witness, and first or last will bear witness. As they kept or broke these natural laws and dictates, their consciences either acquitted or condemned them. Nothing speaks more terror to sinners, and more comfort to saints, than that Christ shall be the Judge. Secret services shall be rewarded, secret sins shall be then punished, and brought to light.