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6. Therefore shall my people know. In this verse he concludes what he had glanced at in the two preceding verses, that at length the people must be redeemed by God, who cannot be unlike himself; for, if he redeemed the fathers, if he always assisted the Church, their posterity, whom he has adopted in the same manner, will never be suffered by him to be overwhelmed. We ought carefully to observe the word “know;” for to “know the name of the Lord” is to lay aside every false opinion, and to know him from his word, which is his true image, and next from his works. We must not imagine God according to the fancy of men, but must comprehend him as he declares himself to us. The Lord, therefore, concludes that he will actually assist them, and will fulfill all that he has promised, that the people may know that their hope has not been without foundation, and that they may be more and more confirmed in the knowledge of his name. We must keep in remembrance what we have elsewhere said about experimental knowledge, which confirms the truth of the word.

That it is I who speak. The verb “to speak” relates to the promises. הנני (hinni,) Behold I, relates to actual power; as if he had said, “Although now there be nothing more than that there sound in your ears the words by which I promise what is hardly probable, yet you shall speedily obtain it; for I will actually accomplish what I promise.” Hence we ought to draw the universal doctrine, that the promises of God and the fulfillment of them are linked together by an indissoluble bond. Whenever, therefore, Satan tempts and urges us to distrust, as if God had forsaken and abandoned us, we must come back to this point, and place our confidence in God, who never promises anything in vain. “If hitherto he does not perform, yet he will assist in due time.”

7. How beautiful upon the mountains. The Prophet again confirms believers as to the certainty of the word of God, that they may be fully persuaded that they shall be restored to their former liberty, and may comfort their hearts by assured hope during that hard bondage. He pronounces magnificent commendations on this message, that believers may be convinced that God holds out to them, in their calamity, the hope of future salvation; and indeed, when God speaks, they ought to accept the consolation, that, relying on it, they may calmly and patiently wait for the fulfillment of the promise. Thus, in order that believers may bridle their desires by patience, he splendidly adorns the word of God. “Will you be so ungrateful as not to rest satisfied with that incomparable treasure of the word which contains so many benefits? Will you give way to unruly passions? Will you complain of God?” He wishes to guard against distrust the people who were drawn away by various allurements, and did not fully rely on the word of God; and therefore he praises the excellence of the doctrine, and shews that the Lord bestows upon “us more than we can say or think.” (Ephesians 3:20.)

He states that he does not now speak of every kind of doctrine, but of that which is adapted to consolation, and therefore shews that “beautiful” and lovely is the approach of those who bring consolation from the mouth of God, which can not only alleviate our grief, but even impart to us abundant joy. Here he speaks of the doctrine of salvation, and consequently says that peace, happiness, salvation, is proclaimed. By the word “peace” he denotes a prosperous and happy condition, as we have already in other passages explained fully the signification of this term.

That saith to Zion. Hence we infer what is the beginning of that doctrine which Isaiah preaches, and what we ought chiefly to desire, namely, that the kingdom of God may be erected among us; for until he reign among us, everything must go in with us, and therefore we must be miserable, as, on the other hand, when God is pleased to take care of us, this of itself is the chief part of salvation; and this, too, is the only way of obtaining peace, though the state of affairs be ruinous and desperate. And let us remember that this message is sent to the Church; for it cannot apply to heathens that know not God.

Paul quotes this passage, in order to prove that the preaching of the Gospel proceeds not from men but from God, and that the ministers who bring the message of salvation are sent by him. He employs this chain of reasoning, — “Whosoever shall call on the name of the Lord shall be saved. But it is impossible for any one to call on God till he know him; for there can be no entrance to calling on him till it is opened up by faith, that, embracing God as our Father, we may familiarly pour our cares into his bosom. Now, the foundation of it is doctrine, by which the Lord has revealed himself to us, and for that purpose employs the agency and ministry of men. Therefore he adds, lastly, that there will be none to preach till he be sent by God.” (Romans 10:15.)

But it may be thought that Paul tortures the Prophet’s words; for Isaiah does not say that God sends ministers, but that their approach and presence is desirable. I reply, Paul took this principle for granted, that nothing is desirable but what comes from God. But whence comes salvation? From men? No; for none but God can be the author of such a distinguished benefit. Justly, therefore, does he conclude that it proceeds from God, and not from man.

8. The voice of thy watchmen. He continues his argument; for he shews that there shall be such a restoration of the people, that the messengers shall venture boldly to proclaim it. To lift up the voice has the same meaning with the phrase, “on the mountains,” which he formerly employed. (Verse 7.) The matter will not be hidden, but so clear and evident as to draw forth universal admiration. They who speak of what is doubtful matter mutter inaudibly, ⁴¹⁴¹     “Murmurent entre les dents.” “Mutter between the teeth.” and do not venture to “lift up the voice;” but here there will be nothing doubtful or uncertain.

The Prophet borrowed the metaphor from sentries which are commonly placed in cities, though the designation of “watchmen” is usually given to all Prophets, because they are placed, as it were, on watch-towers, to keep watch over the safety of the people. When he says that they shall lift up the voice, he means that there will be silence during the captivity, because the voice of the Prophets shall not be heard; for although they warn every one privately, yet there will be no freedom of speech. Hence also Jeremiah says, “I will put my mouth in the dust.” (Lamentations 3:29) But when the Lord shall be pleased to lead forth the people, the mouth of watchmen, who were formerly dumb, shall be opened to proclaim that they are at liberty to return; for they will not speak within private walls, or impart moderate consolation, but will openly proclaim that salvation. On this subject I have spoken fully at the beginning of the fortieth chapter. ⁴²⁴²     See Com. on Isaiah, Vol. 3, p. 197.

Eye to eye; that is, openly. This extends, indeed, to spiritual conversion; but let us not on that account depart from the literal sense, so as not to include also the benefit which the Lord conferred on the ancient people; for, when he restored the Jews to liberty, and employed the ministry of Zerubbabel, Ezra, and Nehemiah, these things were fulfilled. Yet at the same time they ought to be continued down to the coming of Christ, by which the Church was gathered out of all parts of the world. But we ought also to go forward to Christ’s last coming, by which all things shall be perfectly restored.

9. Praise ye, rejoice together. He exhorts believers to thanksgiving, but chiefly confirms them in the hope and confidence of this salvation; as if the actual enjoyment of it already called them to thank God for it. ⁴³⁴³     “A en remercier Dieu.” We are not sufficiently moved, when the Lord testifies that he will assist us, and think that we are deceived, if he do not actually show it. On this account the Prophets insist much on strengthening the hearts of believers, and placing the fact almost before their eyes. Although it appears to be unreasonable and inappropriate to prescribe a song of joy in the midst of grief, yet we have elsewhere seen that this form of expression is well fitted to arouse those who groan under the burden of sorrow, fear, and cares.

Ye wildernesses of Jerusalem. He calls them “wildernesses” or waste places “of Jerusalem,” that, notwithstanding its ruin and destruction, they might still hope that it would be restored. And this appellation is better adapted for shaking off fear than if he had called her prosperous or flourishing; for, in consequence of their condition being very wretched, nothing would have led them to think that these promises related to them except a description of their misery, against which they needed to be fortified, in order that, though they beheld nothing but desolation and hideous ruin, still they might look for restoration with assured confidence.

For Jehovah hath comforted his people. The Lord hath changed the mourning of the people into joy, and out of captivity hath made them free. Yet some person will say ⁴⁴⁴⁴     “Quelqu’un dira.” that this had not yet happened. But in the promises of God, as in a mirror, we ought to behold those things which are not yet visible to our eyes, even though they appear to us to be contrary to reason.

He hath redeemed Jerusalem. Here we see that to deliver the Church is God’s own work. And if we ought to judge thus of the redemption from Babylon, which was but of a shadowy nature, what shall we say of the spiritual redemption? Can it be ascribed to men without grossly insulting God? As it belongs to God alone to deliver the Church, so to him it likewise belongs to defend its liberty.