In these verses we have,

I. The desert land blooming. In the foregoing chapter we had a populous and fruitful country turned into a horrid wilderness; here we have in lieu of that, a wilderness turned into a good land. When the land of Judah was freed from the Assyrian army, those parts of the country that had been made as a wilderness by the ravages and outrages they committed began to recover themselves, and to look pleasantly again, and to blossom as the rose. When the Gentile nations, that had been long as a wilderness, bringing forth no fruit to God, received the gospel, joy came with it to them, Ps. 67:3, 4; 96:11, 12. When Christ was preached in Samaria there was great joy in that city (Acts 8:8); those that sat in darkness saw a great and joyful light, and then they blossomed, that is, gave hopes of abundance of fruit; for that was it which the preachers of the gospel aimed at (John 15:16), to go and bring forth fruit, Rom. 1:13; Col. 1:6. Though blossoms are not fruit, and often miscarry and come to nothing, yet they are in order to fruit. Converting grace makes the soul that was a wilderness to rejoice with joy and singing, and to blossom abundantly. This flourishing desert shall have all the glory of Lebanon given to it, which consisted in the strength and stateliness of its cedars, together with the excellency of Carmel and Sharon, which consisted in corn and cattle. Whatever is valuable in any institution is brought into the gospel. All the beauty of the Jewish church was admitted into the Christian church, and appeared in its perfection, as the apostle shows at large in his epistle to the Hebrews. Whatever was excellent an desirable in the Mosaic economy is translated into the evangelical institutes.

II. The glory of God shining forth: They shall see the glory of the Lord. God will manifest himself more than ever in his grace and love to mankind (for that is his glory and excellency), and he shall give them eyes to see it, and hearts to be duly affected with it. This is that which will make the desert blossom. The more we see by faith of the glory of the Lord and the excellency of our God the more joyful and the more fruitful shall we be.

III. The feeble and faint-hearted encouraged, Isa. 35:3, 4. God’s prophets and ministers are in a special manner charged, by virtue of their office, to strengthen the weak hands, to comfort those who could not yet recover the fright they had been put into by the Assyrian army with an assurance that God would now return in mercy to them. This is the design of the gospel, 1. To strengthen those that are weak and to confirm them—the weak hands, which are unable either to work or fight, and can hardly be lifted up in prayer, and the feeble knees, which are unable either to stand or walk and unfit for the race set before us. The gospel furnishes us with strengthening considerations, and shows us where strength is laid up for us. Among true Christians there are many that have weak hands and feeble knees, that are yet but babes in Christ; but it is our duty to strengthen our brethren (Luke 22:32), not only to bear with the weak, but to do what we can to confirm them, Rom. 15:1; 1 Thess. 5:14. It is our duty also to strengthen ourselves, to lift up the hands which hang down (Heb. 12:12), improving the strength God has given us, and exerting it. 2. To animate those that are timorous and discouraged: Say to those that are of a fearful heart, because of their own weakness and the strength of their enemies, that are hasty (so the word is), that are for betaking themselves to flight upon the first alarm, and giving up the cause, that say, in their haste, “We are cut off and undone” (Ps. 31:22), there is enough in the gospel to silence these fears; it says to them, and let them say it to themselves and one to another, Be strong, fear not. Fear is weakening; the more we strive against it the stronger we are both for doing and suffering; and, for our encouragement to strive, he that says to us, Be strong has laid help for us upon one that is mighty.

IV. Assurance given of the approach of a Saviour: “Your God will come with vengeance. God will appear for you against your enemies, will recompense both their injuries and your losses.” The Messiah will come, in the fulness of time, to take vengeance on the powers of darkness, to spoil them, and make a show of them openly, to recompense those that mourn in Zion with abundant comforts. He will come and save us. With the hopes of this the Old-Testament saints strengthened their weak hands. He will come again at the end of time, will come in flaming fire, to recompense tribulation to those who have troubled his people, and, to those who were troubled, rest, such a rest as will be not only a final period to, but a full reward of, all their troubles, 2 Thess. 1:6, 7. Those whose hearts tremble for the ark of God, and who are under a concern for his church in the world, may silence their fears with this, God will take the work into his own hands. Your God will come, who pleads your cause and owns your interest, even God himself, who is God alone.