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3. For I will pour waters. He continues the same subject, and at the same time explains what will be the nature of that assistance which he has promised. But we ought always to keep in remembrance that these prophecies relate to that sorrowful and afflicted period of which he formerly spoke, that is, when the people, in the extremity to which they were reduced, might think that they were altogether forsaken, and that all the promises of God were vain. Isaiah meets this doubt, and compares the people to a dry and thirsty land, which has no moisture at all. By this metaphor David also describes his wretchedness. (Psalm 143:6.) Although therefore they were worn out by afflictions, and the vital moisture was decayed, yet, that they might not throw away courage in their deepest distresses, they ought to have set before their minds this declaration of the Prophet. We, too, when we are brought into the greatest dangers, and see nothing before us but immediate death, ought in the same manner to betake ourselves to these promises, that we may be supported by them against all temptations. Yet we must feel our drought and poverty, that our thirsty souls may partake of this refreshing influence of the waters.

I will pour my Spirit. Jehovah himself explains what he means by waters and rivers, that is, his Spirit. In another passage the Spirit of God is called “water,” but in a different sense. When Ezekiel gives the name “water” to the Holy Spirit, he at the same time calls it “clean water,” with a view to cleansing. (Ezekiel 36:25.) Isaiah will afterwards call the Spirit “waters,” but for a different reason, that is, because by the secret moisture of his power he quickens souls. But these words of the Prophet have a wider signification, because he does not speak merely of the Spirit of regeneration, but alludes to the universal grace which is spread over all the creatures, and which is mentioned in Psalm 105:30, “Send forth thy Spirit, and they shall be created, and he will renew the face of the earth.” As David declares in that passage that every part of the world is enlivened, so far as God imparts to it secret vigor, and next ascribes to God might and power, by which, whenever he thinks fit, he suddenly revives the ruinous condition of heaven and earth, so now for the same reason Isaiah gives the appellation “water” to the sudden renewal of the Church; as if he had said that the restoration of the Church is at God’s disposal, as much as when he fertilizes by dew or rain the barren and almost parched lands.

Thus the Spirit is compared to “water,” because without Him all things decay and perish through drought, and because by the secret watering of his power he quickens the whole world, and because the barrenness occasioned by drought and heat is cured in such a manner, that the earth puts on a new face. This is still more fully explained by the word which he afterwards employs, Blessing.

4. And they shall spring up. These words contain nothing more than what I quoted from Psalm 104:30, that, when the Spirit of God has been sent forth, the whole face of the earth is renewed, and those fields which formerly were burnt up with thirst are green and flourish, just as the herbs grow, after having been watered by the rains. By these metaphors he extends the view of this subject, and more fully shews that it is quite as easy for God to enlarge by additional offspring the Church, which was desolate, and which had been reduced to ruinous and frightful solitude, as to impart to the earth the power of bringing forth. Yet, though he does not speak of regeneration, still we may apply to it this statement; because he speaks of the restoration of the Church, the chief part of which is the new creature by which the Lord restores his image in the elect. This doctrine may indeed be drawn from it and more copiously explained, but we must first explain the Prophet’s design, and lay open the plain and natural meaning of his words.

5. One shall say. Hitherto the Prophet has spoken metaphorically, but now expresses his meaning plainly without any figure of speech. He shews what is the nature of that vegetation and herbage of which he spoke. It means that out of all nations the Lord will gather his people, and will bring into his Church those who were formerly strangers, and will raise up and enlarge his Church, which formerly appeared to be reduced to nothing; for all shall flock to her from every quarter, and shall wish to be enrolled in the number of believers, as it is also said,

“Behold Philistia, Tyre, and Ethiopia; that man was born there.” (Psalm 87:4.)

That passage, though hitherto it seemed to be obscure, through the mistakes of interpreters, is exceedingly well adapted to the illustration of this prophecy, that believers, who might have been terrified and ashamed on account of their diminished numbers, (for we know that but a small number returned from captivity,) might cherish hope of that illustrious and magnificent grace of Redemption which had been celebrated by the prophets. To meet these views, that Prophet, whoever he was, that was the author of the psalm, declares that the Babylonians and Egyptians shall be citizens of the Church, and that the Ethiopians and Tyrians, and those who formerly were strangers, shall come for the purpose of being enrolled among the people of God. “Now,” says he, “Jerusalem lies waste; but one day God will not only gather those who are scattered, but will also call others from every quarter, and will unite in one body those who are now at the greatest variance, so that they shall boast of being citizens of Jerusalem, and shall belong to the body of the chosen people as much as if they had been natives.” The same thing is taught in this passage by the Prophet Isaiah, from whom the author of the psalm undoubtedly borrowed that sentiment.

And another shall be called by the name of Jacob. The general meaning is, that there will be a vast assembly of men, who shall be united in faith and in obedience to the one true God. But as, in a registration, every person either pronounces or writes his own name, the Prophet, keeping his eye on this custom, employs the following modes of expression, — “One shall write with his hand, I am God’s, and shall take the surname of Israel; another shall acknowledge that he is God’s, and shall be called by the name of Jacob.” He describes something new and uncommon, for he who formerly had nothing to do with God shall boast that God hath adopted him. “To be called” is in this place equivalent to the French phrase, Se reclamer, that is, “to declare one’s self to belong to a person;” just as formerly, when he spoke of women to whom the name of their husbands served for a protection, he introduces them as saying, “Let thy name be called on us,” that is, “Let us be named by thy name.” (Isaiah 4:1.)

Although Isaiah appears, in this passage, to distinguish between those who in express terms shall declare that they belong to the people of God, and shall wish to be named by the name of Jacob, yet both clauses refer to the same persons, because to be a child of God, and to be an Israelite, are two things closely connected, for God determines that the Church shall be the mother of all his children. Yet it ought to be remarked, that none are the lawful citizens of the Church but those who submit to the government of God. If the Prophet had passed by the name of God and mentioned “Jacob” and “Israel,” still we must have begun with the Head, from whom proceeds all relationship both in heaven and in earth; but, that there may be no remaining ambiguity, he has twice described this order, that none are reckoned to belong to the seed of Jacob but they who obey God.

Hence we easily see what is the Prophet’s meaning; for he shews that the Church, so long as she is destitute of the blessing of God, withers and gradually falls into decay; but that, when the Spirit of God has been poured out, she is quickened, and at length gathers strength, not only for recovering her former condition, but so as to grow by wonderful increase beyond expectation. Let us remember, however, that the Prophet does not speak of the order of nature, as if the new children of the Church were born such from the womb, because no person gains such high rank by his own industry; but when they who formerly were aliens have been regenerated by faith, he says that they will eagerly enrol their names, in order to testify that they are the children of God. Thus he describes a change which surpasses nature and all the conceptions of men, when out of the accursed race of Adam is formed a spiritual Israel.

Some think that the Prophet here expresses the small number of believers, when he says, “One shall be called, another shall write;” but that argument has little weight, and even the context furnishes an easy refutation of their error. In my opinion, we should rather understand him to mean that the Church shall be collected in crowds out of various and distant nations; because God will assemble strangers under his authority, and will stir them up to boast sincerely, and not in empty words, that they belong to his people. It ought also to be observed, that true faith cannot stand without breaking forth immediately into confession; for such is the import of these four words, “To be called by the name of Israel, To write, To be known, To say, I am the Lord’s;” for they who sincerely worship God ought not to be dumb, but to testify both by actions and by words what they carry inwardly in their hearts. They profess to be the servants of God, and glory in his name during the whole course of his life.