Of the increase of his government and of peace there shall be no end, upon the throne of David and over his kingdom, to establish it, and to uphold it with judgment and with righteousness, from henceforth even for ever. The zeal of Jehovah of hosts will perform this.
Isaiah 9:5 For every boot of him that is shod for the tumult, and the garment rolled in blood, shall be for burning, fuel for fire.
Isaiah 9:6 For unto us a child is born, unto us a son is given; and the government shall be upon his shoulder; and his name is called Wonderful, Counsellor, Mighty God, Father of Eternity, Prince of Peace.
Isaiah 9:7 Of the increase of his government and of peace there shall be no end, upon the throne of David and over his kingdom, to establish it, and to uphold it with judgment and with righteousness, from henceforth even for ever. The zeal of Jehovah of hosts will perform this.
Isaiah 9:8 The Lord sent a word unto Jacob, and it lighteth upon Israel.
Isaiah 9:9 And all the people shall know [it], Ephraim and the inhabitant of Samaria, that say in pride and stoutness of heart,
The verse centers on "increase", "government", "peace", "shall", "upon", "throne", and "david". It is saying that the verse draws attention to "increase" and "government", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 6's "For unto us a child is born..." into verse 8's "The Lord sent a word unto Jacob...", so "increase" and "government" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "increase" and "government" with trust shaped by these words, not by a vague optimism outside the passage.