John Chrysostom
Notice Paul’s prudence. Since he called both things righteousness, he prevented the Jews who had believed from thinking that they had one righteousness but lacked the other, and for this reason were accused of lawlessness.
As newly converted, they still had reason to fear. He also prevented the Jews from supposing that they would yet fulfill righteousness and from saying, “If until now we have not fulfilled it, surely we will fulfill it.”
See what the Apostle does. He proves that righteousness is one, that legal righteousness is contained in righteousness according to faith.
Whoever has acquired righteousness according to faith has also fulfilled legal righteousness. Whoever has rejected the first has also been deprived of the latter.
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If Christ is the goal of the Law, then one who does not have Christ does not have righteousness, even if he thinks he has it. But one who has Christ has attained everything, even if he has not fulfilled the Law.
The goal of medical treatment is health. One who can make a man healthy has everything, even if he does not know the medical art.
One who cannot heal loses everything, even if he thinks he is following the art. So it is also with the Law and faith.
Whoever has faith has reached the goal of the Law. Whoever is outside faith is a stranger both to faith and to the Law.
What exactly did the Law desire? To make man righteous. But it proved powerless, because no one fulfilled the Law.
Such was the goal of the Law. Toward this everything inclined. For this everything was done: feasts, commandments, sacrifices, and all the rest, so that man might be justified.
But Christ reached this goal more surely through faith. Therefore, the Apostle says, do not fear that you violate the Law after you have come to faith.
You transgress the Law when, because of the Law, you do not believe in Christ. But when you believe in Him, you have also fulfilled the Law, and much more.
For you have attained a much greater righteousness.
“The end of the Law is Christ,” that is, its fulfillment.
Just as the Savior, when He came, became the completion of the Law and the Prophets, so the Spirit is the completion of the Gospel. Christ, when He came, completed in Himself what had been spoken by the Father in the Law and through the prophets.
Therefore Paul says, “Christ is the fulfillment of the Law” (cf. Rom 10:4). The Holy Spirit, when He came, completed what belongs to the Gospel.
What is in the Law, Christ completes. What is in the teaching of Christ, the Spirit completes. This is not because the Father is imperfect.
Rather, as Christ appeared confirming what is the Father’s, so the Holy Spirit also appeared confirming what is the Son’s.
He fulfilled the Law for us. It is truly worthy of wonder that He not only fulfilled the Law Himself, but also granted its fulfillment to us.
Paul explains this when he says that “the end of the Law is Christ, unto righteousness for everyone who believes” (Rom 10:4). He also says that He “condemned sin in the flesh, that the righteous requirement of the Law might be fulfilled in us, who walk not according to the flesh” (Rom 8:3-4).
Elsewhere he says: “Do we then make void the Law through faith? Certainly not. Rather, we establish the Law” (Rom 3:31).
Since the goal of the Law was to make man righteous, which it nevertheless could not do, the Lord Himself satisfied this purpose of the Law.
He descended to earth and established the manner of justification through faith. What the Law could not do through letters, Christ Himself accomplished through faith. Therefore He says, “I did not come to destroy” the Law.