“No contemporary scholar maintains that the entire book, or even most of it, was written by one person”.. Wikipedia reports on the Book of Isaiah. A prophet, by definition to quote the word of God comes from God. “Here now my words:if there be any prophet among you, I the Lord will make himself known unto him….(Num.12:6).” It is not a single person or 100 had a hand in it is immaterial. Some scholars tend to divide the Book of Isaiah into three parts the first section comprising of chapters 1-39 as written by the Prophet himself and the second part from chapters 40-55 as Deutero-Isaiaih. The supplement of the two are compiled in Trito-Isaiah chapters 56 to 66. Needless to mention that no scholarship can better than the wisdom of God who chooses for His service people of a different calibre. They have to be faithful to their calling and speak only what was revealed, vision or dream included.
Trees of righteousness hold spiritual significance in eternity in the same manner as the tree of life served in the Garden of Eden. Adam was free to eat of the fruit of it. He commanded him not to eat of the fruit of the knowledge of good and evil (Ge.2:17) The tree of life therefore was the seal of his Authority. This is further corroborated by the ‘Cherubims and a flaming sword’ signifying Adam and Eve by flouting his Authority did not belong there. Adam and Jesus are both qualified as sons of God (Lk.3:38). Introducing the tree of Life God is making a point. Righteousness of divine authority has been re-established by God the Son under the new heaven. So the nations whose healing were dependent on the leaves inhabit the new earth.”…God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: are planted by the Lord …(Is.45:18) Day of the Lord calls for purging the earth but the glory of God when re-established shall be glorious too. It is to this this verse alludes” The glory of Lebanon shall come unto thee, the fir tree, the pine tree, and the box together, to beautify the place of my sanctuary; and I will make the place of my feet glorious.
(Is.60:13).” This reminds us of the verse the heaven is my throne and the earth is my footstool. In new heaven also the new earth bears the same status. It is where kings of nations bring glory and honor(Re.21:24) Symbol of trees of righteousness is sustained by the symbolism of cedars,-the glory of Lebanon, the fir tree, the pine tree etc.,
The Throne of God and of the Lamb would indicate New Jerusalem and Isaiah as a prophet is not however making any distinction of it as part of the new earth.
For Zion’s sake will I not hold my peace, and for Jerusalem’s sake I will not rest, until the righteousness thereof go forth as brightness, and the salvation thereof as a lamp that burneth.
2 And the Gentiles shall see thy righteousness, and all kings thy glory: and thou shalt be called by a new name, which the mouth of the Lord shall name.
3 Thou shalt also be a crown of glory in the hand of the Lord, and a royal diadem in the hand of thy God.
4 Thou shalt no more be termed Forsaken; neither shall thy land any more be termed Desolate: but thou shalt be called Hephzibah, and thy land Beulah: for the Lord delighteth in thee, and thy land shall be married.
5 For as a young man marrieth a virgin, so shall thy sons marry thee: and as the bridegroom rejoiceth over the bride, so shall thy God rejoice over thee.
6 I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night: ye that make mention of the Lord, keep not silence,
7 And give him no rest, till he establish, and till he make Jerusalem a praise in the earth.
8 The Lord hath sworn by his right hand, and by the arm of his strength, Surely I will no more give thy corn to be meat for thine enemies; and the sons of the stranger shall not drink thy wine, for the which thou hast laboured:
9 But they that have gathered it shall eat it, and praise the Lord; and they that have brought it together shall drink it in the courts of my holiness.
10 Go through, go through the gates; prepare ye the way of the people; cast up, cast up the highway; gather out the stones; lift up a standard for the people.
11 Behold, the Lord hath proclaimed unto the end of the world, Say ye to the daughter of Zion, Behold, thy salvation cometh; behold, his reward is with him, and his work before him.
12 And they shall call them, The holy people, The redeemed of the Lord: and thou shalt be called, Sought out, A city not forsaken.