12 When the Gentiles sin, they will be destroyed, even though they never had God's written law. And the Jews, who do have God's law, will be judged by that law when they fail to obey it. 13 For merely listening to the law doesn't make us right with God. It is obeying the law that makes us right in his sight. 14 Even Gentiles, who do not have God's written law, show that they know his law when they instinctively obey it, even without having heard it. 15 They demonstrate that God's law is written in their hearts, for their own conscience and thoughts either accuse them or tell them they are doing right.
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.