by John Calvin
Paul clearly declares that our sins were expiated by the death of Christ, because it was impossible for the law to confer righteousness upon us. It hence follows, that more is required by the law than what we can perform; for if we were capable of fulfilling the law there would have been no need to seek a remedy elsewhere. It is therefore absurd to measure human strength by the precepts of the law; as though God in requiring what is justly due, had regarded what and how much we are able to do.
Because it was weak etc. That no one might think that the law was irreverently charged with weakness, or confine it to ceremonies, Paul has distinctly expressed that this defect was not owing to any fault in the law, but to the corruption of our flesh; for it must be allowed that if any one really satisfies the divine law, he will be deemed just before God. He does not then deny that the law is sufficient to justify us as to doctrine, inasmuch as it contains a perfect rule of righteousness: but as our flesh does not attain that righteousness, the whole power of the law fails and vanishes away. Thus condemned is the error or rather the delirious notion of those who imagine that the power of justifying is only taken away from ceremonies; for Paul, by laying the blame expressly on us, clearly shows that he found no fault with the doctrine of the law.