John Chrysostom
As negligence and slackness, which weaken labors, oppose the virtue shown in works, and a strongly vigilant soul is needed in order not to yield, so whenever it is necessary to believe, thoughts arise that trouble and weaken the minds of many.
A soul full of strength is needed to repel them. Therefore the Apostle exposes these very thoughts. As he did when speaking of Abraham, so he does here.
There, after proving that Abraham was justified by faith, the Apostle praised the quality of faith. He did this so that no one might think Abraham received so great a crown idly and without cause.
He says, "Who against hope believed in hope, that he might become the father of many nations. And he did not weaken in faith, nor consider his own body, already dead, or the deadness of Sarah's womb.
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"He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God and being fully convinced that what He had promised He was also able to perform" (Rom 4:18-21).
By this the Apostle proved that Abraham needed both works and an exalted soul, one that accepts what is beyond hope and is not scandalized by what is visible.
So he acts here also. He proves that we need a philosophical mind, a strong will, and a will that strives toward heaven.
He did not simply say, "Do not say," but, "Do not say in your heart." That is, do not even think of doubting and saying to yourself, How is this possible?
Do you see that the special character of faith consists chiefly in this: rejecting all earthly considerations, to seek what is above nature, and casting away the weakness of reasonings, to receive everything through the almighty power of God?
The Jews said not only this, but also that it is impossible to be justified by faith. But the Apostle applies the same thing to another event.
By showing that this event is so great that, even after its fulfillment, it requires faith, he persuades us that it is just to weave a crown for believers.
He uses a saying of the Old Testament, always striving to avoid accusations of innovation and opposition to it. What the Apostle says here about faith, Moses said to the Jews about the commandment.
Moses was proving that they had received many benefits from God. There is no need, the Apostle reasons, to say that one must ascend into heaven or cross the vast sea and only then receive the commandments.
For God has made this great and difficult matter easy for us.