Verse 13. - Instead of the thorn shall come up the fir tree. "Briars and thorns" were to overgrow the unfruitful vineyard, according to Isaiah 5:6; and to cover the land of God's people, according to Isaiah 32:13. This would be literally the case to a large extent, while the land was allowed to lie waste. The literal meaning is not, however, the whole meaning, or even the main meaning, here. "Briars and thorns" represent a general state of wretchedness and sin. The "fir" and "myrtle" represent a happy external condition of life, in which men "do righteously." It shall be to the Lord for a name. This "regenerated creation" will show forth the glory of God to mankind at large, and "get him a name" among them (comp. Isaiah 63:12; Jeremiah 13:11). For an everlasting sign. It will also he to God himself an enduring sign of the covenant of peace which he has made with his people, not to hide his face from them any more, but to have mercy on them "with everlasting kindness" (Isaiah 54:7-10).

55:6-13 Here is a gracious offer of pardon, and peace, and of all happiness. It shall not be in vain to seek God, now his word is calling to us, and his Spirit is striving with us. But there is a day coming when he will not be found. There may come such a time in this life; it is certain that at death and judgment the door will be shut. There must be not only a change of the way, but a change of the mind. We must alter our judgments about persons and things. It is not enough to break off from evil practices, we must strive against evil thoughts. To repent is to return to our Lord, against whom we have rebelled. If we do so, God will multiply to pardon, as we have multiplied to offend. But let none trifle with this plenteous mercy, or use it as an occasion to sin. Men's thoughts concerning sin, Christ, and holiness, concerning this world and the other, vastly differ from God's; but in nothing more than in the matter of pardon. We forgive, and cannot forget; but when God forgives sin, he remembers it no more. The power of his word in the kingdoms of providence and grace, is as certain as in that of nature. Sacred truth produces a spiritual change in the mind of men, which neither rain nor snow can make on the earth. It shall not return to the Lord without producing important effects. If we take a special view of the church, we shall find what great things God has done, and will do for it. The Jews shall come to their own land; this shall represent the blessings promised. Gospel grace will make a great change in men. Delivered from the wrath to come, the converted sinner finds peace in his conscience; and love constrains him to devote himself to the service of his Redeemer. Instead of being profane, contentious, selfish, or sensual, behold him patient, humble, kind, and peaceable. The hope of helping in such a work should urge us to spread the gospel of salvation. And do thou help us, O Spirit of all truth, to have such views of the fulness, freeness, and greatness of the rich mercy in Christ, as may remove from us all narrow views of sovereign grace.Instead of the thorn shall come up the fir tree, and instead of the brier shall come up the myrtle tree,.... The meaning of which either is, that instead of wicked men, comparable to briers and thorns for their being fruitless and useless, harmful and pernicious, under a curse, and their end to be burned, there good men, comparable to fruitful and beautiful trees, shall be; which was eminently true when the Gospel was preached in the Gentile world; see Isaiah 35:1 so the Targum,

"instead of the ungodly shall rise up righteous persons, and instead of sinners shall rise up such as are afraid to sin;''

or else the sense is, that such who are like briers and thorns in their nature state, being no better than others, but children of wrath, even as others, shall by the grace of God be made like fir and myrtle trees; as great a change shall be wrought in them as if briers and thorns were changed into fir and myrtle trees; to which the saints are sometimes compared, particularly to myrtle trees, Zechariah 1:10, because goodly to look at, of a sweet smell, ever green, flourish in watery places, and bring forth fruit:

and it shall be to the Lord for a name, for an everlasting sign that shall not be cut off; that is, these persons, who are become and made like to fir and myrtle trees, shall be called by the name of the Lord, shall bear his name, support his Gospel and interest, and be for his praise, and to the glory of his grace, who has done such great and wonderful things for them;

and shall be for an everlasting sign and monument of the love, grace, power, and faithfulness of God, and for a sure token that the church and people of God shall not be cut off, but that God will have a people to serve him as long as the sun and moon endure.