Rom 9:28

“Accordingly, when He uttered such denunciations as, "Thou shalt do no murder; thou shalt not commit adultery; thou shalt not steal; thou shalt not bear false witness," He taught me to refrain from doing to others what I should be unwilling to have done to myself; and therefore the precept developed in the Gospel will belong to Him alone, who anciently drew it up, and gave it distinctive point, and arranged it after the decision of His own teaching, and has now reduced it, suitably to its importance, to a compendious formula, because (as it was predicted in another passage) the Lord-that is, Christ" was to make (or utter) a concise word on earth."”

“"He will finish the work, and cut it short in righteousness," he says, "because a short work will the Lord make upon the earth." What he means then is somewhat of this sort. There is no need of fetching a circuit, and of trouble, and the vexation of the works of the Law, for the salvation is by a very short way. For such is faith, it holds salvation in a few short words. "For if thou shalt confess with thy mouth the Lord Jesus, and believe in thine heart that God hath raised Him from the dead, thou shalt be saved." Now you see what this, "the Lord shall make a short word upon earth," is. And what is indeed wonderful is, that this short word carries with it not salvation only, but also righteousness.”

“The historical sense is that, just as I shorten and finish off a sentence, so God will accomplish this with all speed. But in prophecy, the shortened sentence is understood to mean the New Testament, because everything is briefly summarized in it.”

“Now he shows how the remnant will be saved, and says that there is no need to labor, to go far, and to exhaust oneself with works of the law. God, he says, who brings to completion and accomplishes the word of faith in a short way throughout all the earth, will do this "in righteousness," that is, in order to justify those who have accepted it. "If you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved" (Rom. 10:9). This is the shortened word, that is, the brief sayings of faith.”

“Second, at for he shall finish his word, he cites the cause of salvation: first, the efficacy of the word of the Gospel, saying: for he shall finish his word and cut it short in equity. Note here a twofold efficacy of the evangelical word. The first is that the word is fulfilling, i.e., perfective: the law made nothing perfect (Heb 7:19); but the Lord says, I have come not to abolish the law but to fulfill (Matt 5:17), because he applied the truth to the figures of the law, explained the moral precepts of the law properly, removed occasions for transgressing them and even added counsels of perfection. Thus he said to the young man who had kept all the precepts of the law: one thing is lacking to you. If you would be perfect, go and sell what you possess and give to the poor (Matt 19:21). For this reason he said to his disciples: you must be perfect, as your heavenly Father is perfect (Matt 5:48). The second efficacy is that the word is cut short. This is suitably joined to the first efficacy, because the more perfect a word is the more profound it is and, as a consequence, simpler and briefer. Now the word of the Gospel shortens the words of the law, because it included all the figurative sacrifices of the law in one true sacrifice, in which Christ offered himself as a victim for us (Eph 5:2). Furthermore, it includes all the moral precepts of the law in the two precepts of charity: on these two precepts depend the law and the prophets (Matt 22:40). Hence he says cut short in equity, either because nothing is omitted of the multitude of figures and precepts of the law, but all are included in the brevity of the Gospel; or because nothing remains of them to be observed but what is equitable according to the dictates of natural reason: all your commands are equitable (Ps 118:72). This should be understood so that the sense is: the word of the Gospel will shorten and perfect in equity. Second, when he says because a short word, he gives the reason for this efficacy, saying, for the Lord upon the earth, i.e., when he lives on earth as man: afterwards he was seen upon earth and conversed with men (Bar 3:38), will make a short word. For the word which the Lord himself spoke in the flesh should be more perfect and powerful than the words he spoke through the prophets, as it says in Hebrews: God, who, at sundry time and in diverse manners, spoke of old to our fathers by the prophets, in these last days he has spoken to us through his Son (Heb 1:1). Or, in another way: for the Lord, i.e., God the Father, will make a short word, i.e., incarnate, because the Son of God emptied himself, taking the form of a slave. He is called brief, not because anything was subtracted from the fullness or greatness of his divinity, but because he underwent our exile and smallness. This decree is considered, however, in Isaiah, where according to our account it is thus said: for if your people, O Israel, shall be as the sand of the sea, a remnant of them shall be converted. The abridged consumption shall overflow with justice. For the Lord God of hosts shall make a consumption, and an abridgment in the midst of all the land (Isa 10:22–23).”

“This has been done in Christ, who said: "Moses wrote about me."”