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17. For, lo, I will create new heavens and a new earth. By these metaphors he promises a remarkable change of affairs; as if God had said that he has both the inclination and the power not only to restore his Church, but to restore it in such a manner that it shall appear to gain new life and to dwell in a new world. These are exaggerated modes of expression; but the greatness of such a blessing, which was to be manifested at the coming of Christ, could not be described in any other way. Nor does he mean only the first coming, but the whole reign, which must be extended as far as to the last coming, as we have already said in expounding other passages.

Thus the world is (so to speak) renewed by Christ; and hence also the Apostle (Hebrews 2:5) calls it “a new age,” and undoubtedly alludes to this statement of the Prophet. Yet the Prophet speaks of the restoration of the Church after the return from Babylon. This is undoubtedly true; but that restoration is imperfect, if it be not extended as far as to Christ; and even now we are in the progress and accomplishment of it, and those things will not be fulfilled till the last resurrection, which has been prescribed to be our limit.

The former things shall not be remembered. Some refer these words to heaven and earth; as if he had said that henceforth they shall have no celebrity and no name. But I choose rather to refer them to the former times; for he means that the joy at being restored shall be so great that they shall no longer remember their miseries. Or perhaps it will be thought preferable to view them as relating to benefits which, though they were worthy of being recorded, lost their name when God’s amazing- grace shone forth. In this sense the Prophet said elsewhere, “Remember ye not the former things.” (Isaiah 43:18.) Not that God wished the first deliverance to be set aside or blotted out of the hearts of believers; but because by comparison the one brought a kind of forgetfulness over the other, just as the sun, when he rises, deprives the stars of their brightness.

Let us remember that these things take place in us so far as we are renewed. But we are only in part renewed, and therefore we do not yet see a new heaven and a new earth. We need not wonder, therefore, that we continue to mourn and weep, since we have not entirely laid aside the old man, but many remains are still left. It is with us also that the renovation ought to begin; because we hold the first rank, and it is through our sin that “the creatures groan, and are subject to vanity,” as Paul shews. (Romans 8:20.) But when we shall be perfectly renewed, heaven and earth shall also be fully renewed, and shall regain their former state. And hence it ought to be inferred, as we have frequently remarked, that the Prophet has in his eye the whole reign of Christ, down to its final close, which is also called

“the day of renovation and restoration.” (Acts 3:21.)

18. But rejoice ye and be glad for ever. He exhorts believers to rejoice, in such a manner as they ought, on account of such a benefit bestowed by God. And this was added for the sake of amplification; because men do not adequately consider God’s other benefits, and especially that which is the highest and most excellent of all; for either they disregard them altogether, or value them less than they ought to do. On this account believers must be aroused and urged by such exhortations as these, that they may not chew themselves to be unthankful or unmindful, or think that it ought to be lightly passed by, that, having been redeemed by the hand of Christ, they carry in their hearts the pledge of eternal and heavenly life. That is the reason why Isaiah chews that believers do not give due praise for redemption in any other way than by continuing their joy through the whole course of their life, and employing themselves in celebrating the praises of God.

For, lo, I create Jerusalem a rejoicing, and her people a joy. At first sight this might be thought harsh; but an excellent meaning is obtained, that the ground of joy in the deliverance of the Church shall be so great as to remove every cloud of sadness. And, indeed, since even afflictions aid our salvation, (Romans 8:28,) we have good reason for rejoicing in them.

19. And I will be glad in Jerusalem. He expresses more than in the preceding verse; for by these words he means that he not only will give to men ground for rejoicing, but even will be a partaker with them in that joy. So great is his love toward us, that he delights in our prosperity not less than if he enjoyed it along with us. And hence we obtain no small confirmation of our faith, when we learn that God is moved, and so powerfully moved, by such an affection toward us. If we are in painful and distressed circumstances, he says that he is affected by grief and sorrow; and, on the other hand, if our condition is pleasant and comfortable, he says that he takes great pleasure in our prosperity. Hence also we have formerly seen that “the Spirit of the Lord is sad and vexed,” (Isaiah 63:10,) when that order which he demands and approves is overturned and confounded; and in another passage he takes upon himself the character of a husband who is satisfied with the love of his wife. (Isaiah 62:5.)

20. There shall be no more thence an infant of days. Some think that this points out the difference between the Law and the Gospel; because “the Law, as a schoolmaster,” (Galatians 3:24,) kept scholars in the first elements, but the Gospel leads us on to mature age. Others suppose it to mean that there will no longer be any distinction of age; because, where life is eternal, no line is drawn between the child and the old man. But I interpret the words of the Prophet in this manner, “Whether they are children or old men, they shall arrive at mature age so as to be always vigorous, like persons in the prime of life; and, in short, they shall always be healthful and robust;” for it is on account of our sins that we grow old and lose our strength. “All our days,” saith Moses, “pass away when thou art angry: we close our years quicker than a word. The days of our years in which we live are seventy years, or, at the utmost, eighty: what goeth beyond this in the strongest is toil and vexation; our strength passeth swiftly, and we fly away.” (Psalm 90:9, 10.) But Christ comes to repair our strength, and to restore and preserve our original condition.

For the son of a hundred years shall die young. It is proper to distinguish between the two clauses; for, after having said that the citizens of the Church shall be long-lived, so that no one shall be taken out of the world till he has reached mature age and fully completed his course, he likewise adds that, even in old age, they shall be robust. Although the greater part of believers hardly support themselves through weakness, and the strength of others decays even before the time, yet that promise is not made void; for, if Christ reigned truly and perfectly in us, his strength would undoubtedly flourish in us, and would invigorate both body and soul. To our sins, therefore, it ought to be imputed, that we are liable to diseases, pains, old age, and other inconveniences; for we do not permit Christ to possess us fully, and have not advanced so far in newness of life as to lay aside all that is old. ²¹⁴²¹⁴     “Tout le vieil homme.” “All the old man.”

Here it ought also to be observed, that blessings either of soul or body are found only in the kingdom of Christ, that is, in the Church, apart from which there is nothing but cursing. Hence it follows that all who have no share in that kingdom are wretched and unhappy; and, however fresh and vigorous they may appear to be, they are, nevertheless, in the sight of God, rotten and stinking corpses.