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12. Therefore ye shall go out with joy. The Prophet concludes the subject of this chapter; for, when he spoke of the mercy of God, his object was, to convince the Jews that the Lord would deliver them. He now applies to his purpose what was contained in his discourse concerning the infinite goodness of God, and shows that his thoughts are very unlike the thoughts of men. And the true way of teaching is this, that we should apply general statements for present use. Finally, he treats of the restoration of the people, which depended on the undeserved mercy of God.

The mountains and hills shall break out before you. By “the mountains and hills” he means that everything which they shall meet in the journey, though in other respects it be injurious, shall aid those who shall return to Jerusalem. They are metaphors, by which he shows that all the creatures bow to the will of God, and rejoice and lend their aid to carry on his work. He alludes to the deliverance from Egypt, (Exodus 14:22) as is customary with the Prophets; for thus is it described by the Psalmist, “The mountains leaped like rams, and the hills like lambs. What ailed thee, O sea, that thou fleddest, and Jordan, (Joshua 3:16) that thou wast driven back? (Psalm 114:4, 5) For the restoration of the Church may be regarded as a renovation of the whole world, and in consequence of this, heaven and earth are said to be changed, as if their order were reversed. But all this depended on former predictions, by which they had received a promise of their return.

13. Instead of the bramble ⁹¹⁹¹     “Instead of the thorn.” ­ Eng. Ver. shall come up the fir-tree. He still extols the power of God, which would be visible in the restoration of the people; for he shows that the change will be such that they shall have an easy road to return. Some explain it allegorically, and suppose that by “brambles” are meant men who wish to do injury, and who inflict wounds on others, and that these shall be “fir­trees,” that is, trees that bear fruit and that are useful to their neighbors; but in expositions of that kind ingenuity is carried to excess. When they say that these things relate to the kingdom of Christ, and on that account ought to be understood in a spiritual sense, I agree with them; for the Prophet begins with the departure from Babylon, and includes the whole condition of the Church, till Christ was manifested to the world. But the propriety of that allegory must not therefore be admitted; for he speaks of the departure from Babylon, and, in order to open it up for his people, he says that he will remove every obstacle, and will supply them with everything necessary, so that they shall suffer no inconvenience. In like manner, when Christ promises the benefit of redemption, he likewise takes away everything that would injure or retard, and even turns those things to a different and totally opposite purpose, that from them also they may receive some benefit. All things (Romans 8:28) tend to the advantage of believers, and those things which would otherwise be injurious and destructive, are employed by God as remedies to purify them, that they may not be devoted to the world, but may become more ready and cheerful in the service of their Master. ⁹²⁹²     “Au service de leur maistre.”

And shall be to Jehovah for a name. When he says that it shall be to God “for a name,” he shows what is the design of the restoration of the Church. It is, that the name of God may be more illustrious among men, and that the remembrance of him may flourish and be maintained. On this account he adds that it shall be a perpetual sign, that is, a monument, and, as we commonly say, a memorial; and although, amidst these tempests, the Church be tossed and agitated in various ways, yet, because the Lord wishes that the remembrance of his name may be everlasting, he will guard and defend her.