21. Is the law then against the promises of God? The certainty and steadiness of the divine purpose being admitted, we are bound equally to conclude that its results are not contrary to each other. Still there was a difficulty to be resolved, arising from the apparent contradiction between the Law and the covenant of grace. This is, perhaps, an exclamation. Dreading no farther contradiction, now that the point is settled, Paul concludes, that the former arguments have placed it beyond a doubt, and exclaims: “Who will now dare to imagine a disagreement between the law and the promises?” And yet this does not prevent Paul from proceeding to remove the difficulties that might still arise.
Before answering the question, he expresses, in his usual manner, a high disdain of such folly; thus intimating the strong abhorrence with which pious men must regard whatever brings reproach on the Divine character. But another instance of high address, which claims our notice, is found in this turn of expression. He charges his adversaries with the offense of making God contradict himself. For from him the Law and the promises have evidently proceeded: whoever then alleges any contradiction between them blasphemes against God: but they do contradict each other, if the Law justifies. Thus does Paul most dexterously retort upon his adversaries the charge which they falsely and calumniously brought against him.
For if there had been a law given. The reply is (what is called) indirect, and does not plainly assert an agreement between the law and the promises, but contains all that is necessary to remove the contradiction. At first sight, you would say that this sentence departs from the context, and has nothing to do with the solution of the question; but this is not the case. The law would be opposed to the promises, if it had the power of justifying; for there would be two opposite methods of justifying a man, two separate roads towards the attainment of righteousness. But Paul refuses to the law such a power; so that the contradiction is removed. I would admit, says he, that righteousness is obtained by the law, if salvation were found in it. But what?