John Chrysostom
As there he said, "For in passing judgment upon another you condemn yourself" (Rom 2:1), so here also he says, "You then who teach another, do you not teach yourself?"
There, however, he uses a sharper expression, while here he uses a gentler one. He did not say: You deserve greater punishment because, though so much was entrusted to you, you made no proper use of it.
Rather, setting forth his thought as a question, he turns to them and says, "You then who teach another, do you not teach yourself?"
Notice Paul's wisdom in another respect also. He lists such advantages of the Jews as did not depend on their zeal, but were a gift from above.
He proves that these advantages, through the Jews' negligence, are not only superfluous for them, but even increase their punishment.
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To be called a Jew, to receive the law, and all the other things the Apostle has just listed, are not their merit. They are a gift of grace from above.
At the beginning he said that hearing the law alone brings no benefit unless fulfillment is added. "For not the hearers of the law," he says, "are righteous before God" (Rom 2:13).
Now he proves something much greater. Not only hearing, but what is more important, the very teaching of the law, will not help the teacher if he does not fulfill what he teaches.
It will not only fail to help him, but will bring a greater punishment upon him.
How skillfully the Apostle uses his expressions. He did not say, You received the law, but, "You rest on the law" (Rom 2:17).
The Jew did not labor by going everywhere and asking what he should do. He possessed the law conveniently, showing the way that led to virtue.
If the pagans had natural reason, in which their advantage lay, since they fulfilled everything without hearing the law, then among the Jews there was a greater convenience.
But if you say, "I not only hear, but also teach," this only increases the punishment.
Since the Jews greatly exalted themselves in this, the Apostle proves that they are especially worthy of ridicule because of it.
When he says, "a guide to the blind," "an instructor of the foolish," and "a teacher of babes" (Rom 2:19-20), he portrays the arrogance of the Jews.
They treated converts from paganism very badly and called them by such names.
Therefore the Apostle dwells at length on what the Jews counted as praise for themselves. He knew that everything said would serve to accuse them all the more.
"Having the form of knowledge and truth in the law" (Rom 2:20). This is like someone who possesses a royal portrait, yet cannot write anything according to it.
Those who do not possess it, however, imitate it faithfully even without the model.