Passage
There will be no end to the increase of His government or of peace, On the throne of David and over his kingdom, To establish it and to uphold it with justice and righteousness From then on and forevermore. The zeal of Yahweh of hosts will accomplish this.
Nearby Context
Isaiah 9:5 For every boot of the booted warrior in the rumbling of battle, And cloak rolled in blood, will be for burning, fuel for the fire.
Isaiah 9:6 For a child will be born to us, a son will be given to us; And the government will rest on His shoulders; And His name will be called Wonderful Counselor, Mighty God, Eternal Father, Prince of Peace.
Isaiah 9:7 There will be no end to the increase of His government or of peace, On the throne of David and over his kingdom, To establish it and to uphold it with justice and righteousness From then on and forevermore. The zeal of Yahweh of hosts will accomplish this.
Isaiah 9:8 The Lord sends a message against Jacob, And it falls on Israel.
Isaiah 9:9 And all the people know it, That is, Ephraim and the inhabitants of Samaria, Saying in lofty pride and in arrogance of heart:
Study Lenses
The verse centers on "increase", "government", "peace", "throne", "david", "kingdom", and "establish". 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 a child will be born to..." into verse 8's "The Lord sends a message against 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.