The holy prophet Haggai explains Saint Isaiah. He says more definitely what this consummating and final thing is, which Isaiah had foretold hundreds of years earlier.
It is this: all nations, not excluding the Jews, would be shaken by the coming of Christ the Lord and by the apostolic preaching. The chosen from them, not all but the remnant, would come into the Holy Church in the Lord.
This began in the second temple of Jerusalem. It was to constitute that temple’s glory, foretold by Saint Haggai.
What the prophet Haggai called the shaking of the nations “yet once more,” Isaiah designates by the “shortened word.” “Shortened,” συντετμημένον, comes from τέμνω, “to cut.”
In our ordinary speech, when someone says a last decisive word, we say, “He cut it off.” He has said the final word, and there is nothing more to seek from him.
The prophetic saying, “a shortened word,” gives the same thought. It means a final, decisive, last word, after which no other is to be expected.
By the expression “word,” one must understand not only a word, but also a deed, a decisive decree, and its fulfillment. It is God’s final institution upon the earth, or, as the Prophet says, in the whole universe.
This can refer to nothing other than the coming of Christ the Savior and the establishment of faith in Him upon the earth. There was a word, or divine arrangement, concerning salvation before the Law.
There was a second after it, in the Law and the Prophets. The final word concerning this, the final arrangement and institution, the Prophet foretells, would be given in the Only-begotten Son of God.
After this no other word is to be expected. This last word, says the Prophet, the Lord will not merely speak, but will make. And it has been made.
Everything has been fulfilled and established, and so it will remain until the end of the age. Such is the meaning of the words, “the Lord will make a shortened word upon the earth.”
But what thought lies in the preceding words, “for He is completing and cutting short the word in righteousness”? The same thought is present here.
The expression is incomplete. It lacks its governing verb. One must supply it with “is.” We then receive: the Lord is completing and cutting short His word. He is completing and cutting short.
He will not forever introduce new institutions and arrangements. He has a final word and deed, which at last He will make.
The word “in righteousness” means not in figures and shadows, but in the very substance of the matter. What connection do these words have with the preceding statement, “the remnant shall be saved”?
In them one may see an indication of the time when this will be fulfilled. The remnant shall be saved in present reality and substance.
When will this be? When the Lord, who will not keep multiplying words with you, finally makes the shortened word upon the earth.
Our commentators understand the shortened word as the ordering of salvation in the Lord Jesus Christ. They understand it as shortened not because it is final, but because in its essence it is brief, in contrast to the complex Law.
But this does not contradict what has been said. It only points to another aspect of the same decisive word and deed of God.
Blessed Theodoret writes: “The Prophet called faith the shortened word. For what the Law taught by many commandments, while it could not provide perfect salvation, the confession of Christ achieved. Faith provided it. Faith is shortened and has no need of long circuits. It is judged by the disposition of the soul and is preached by the tongue.”
Chrysostom says: “This, namely, ‘the Lord will make a shortened word,’ means that there is no need to go far, to labor, and to weary oneself with works of the Law. On the contrary, salvation will be accomplished in a very brief way. For such is faith. In few words it contains salvation. ‘If you confess with your mouth the Lord Jesus,’ says the Apostle, ‘and believe in your heart that God raised Him from the dead, you will be saved’ (cf. Rom 10:9). Do you now understand what it means that ‘the Lord will make a shortened word upon the earth’? The wondrous thing is that this brief word provided not only salvation, but also righteousness.”