John Chrysostom
Therefore, if those who had natural kinship with him are not his sons, but those who imitated his faith, this is precisely the meaning of the words, "In you all nations shall be blessed."
Then it is clear that believing Gentiles also are brought into this kinship.
By these words he shows something else of great importance. They were troubled by the thought that the law was older than faith, and that faith came after the law.
He removes this difficulty as well, showing that faith is older than the law. This is clear from Abraham's example, since Abraham received justification before the law appeared.
At the same time he shows that what happened in the last times happened according to prophecy.
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"And the Scripture," he says, "foreseeing that God would justify the Gentiles by faith, and not by the law, preached the Gospel beforehand to Abraham."
What does this mean? By this he says: "The Lawgiver Himself, before He gave the law, appointed that the Gentiles should be justified by faith."
He did not say "revealed," but "preached the Gospel," so that you may know that the patriarch rejoiced over this manner of justification.
He also strongly desired that it should be brought to fulfillment.
But since they still feared something else, because it was written, "Cursed is everyone who does not continue in all the things written in the book of this law, to do them" (Deut 27:26), he removes this fear too.
Wisely and prudently, he turns what was said in the law to the opposite side. He shows that those who leave the law are not only not cursed, but blessed.
Those who hold to the law are not only not blessed, but cursed.
The zealots of the law said that he who does not keep the law is cursed. But the Apostle shows that he who keeps the law is cursed, and he who does not keep it is blessed.
They also said that one who hopes in faith alone is cursed. But he shows that one who hopes in faith alone is blessed.
How does he prove all this? We have proclaimed to you no ordinary matter, and therefore one must be especially attentive to what will be said next.
The Apostle had already shown this above, saying that the Scripture proclaimed beforehand to the patriarch, "In you all nations shall be blessed."
At that time the law did not yet exist, but faith did. Therefore he drew the following conclusion.