His seed also will I make to endure for ever - This ean apply only to the spiritual David. The posterity of David are long since extinct, or so blended with the remaining Jews as to be utterly indiscernible; but Jesus ever liveth, and his seed (Christians) are spread, and are spreading over all nations; and his throne is eternal. As to his manhood, he is of the house and lineage of David; the government is upon his shoulders, and of its increase there shall be no end, upon the throne of David and on his kingdom to order it and to establish it with judgment and justice, from henceforth even for ever. Isaiah 9:7.
His seed also will I make to endure for ever - That is, His posterity shall occupy the throne:
(a) this would have been true of his descendants, if they had been faithful to God, and had not revolted from him;
(b) it is true of him who is the successor of David in his spiritual kingdom, the Lord Jesus, the Messiah. Compare the notes at Isaiah 9:6-7.
“I have sworn unto David My servant ... with whom My hand shall be established: Mine arm also shall strengthen him.... My faithfulness and My mercy shall be with him: and in My name shall his horn be exalted. I will set his hand also in the sea, and his right hand in the rivers. He shall cry unto Me, Thou art my Father, my God, and the Rock of my salvation. Also I will make him My first-born, higher than the kings of the earth. My mercy will I keep for him forevermore, and My covenant shall stand fast with him.” Psalm 89:3-28. PP 755.1
“His seed also will I make to endure forever,
And his throne as the days of heaven.” Psalm 89:29. PP 755.2
“He shall judge the poor of the people,
He shall save the children of the needy,
And shall break in pieces the oppressor.
They shall fear thee while the sun endureth,
And so long as the moon, throughout all generations....
In his days shall the righteous flourish;
And abundance of peace, till the moon be no more.
He shall have dominion also from sea to sea,
And from the river unto the ends of the earth.”
“His name shall endure forever:
His name shall be continued as long as the sun:
And men shall be blessed in him:
All nations shall call him blessed.” PP 755.3