Passage
And Jehovah will set up the adversaries of Rezin against him, and arm his enemies,
And Jehovah will set up the adversaries of Rezin against him, and arm his enemies,
Isaiah 9:9 And all the people shall know [it], Ephraim and the inhabitant of Samaria, that say in pride and stoutness of heart,
Isaiah 9:10 The bricks are fallen down, but we will build with hewn stones; the sycamore trees are cut down, but we will replace them with cedars.
Isaiah 9:11 And Jehovah will set up the adversaries of Rezin against him, and arm his enemies,
Isaiah 9:12 the Syrians on the east, and the Philistines on the west; and they shall devour Israel with open mouth. For all this his anger is not turned away, and his hand is stretched out still.
Isaiah 9:13 But the people turneth not unto him that smiteth them, and they do not seek Jehovah of hosts.
The verse centers on "jehovah", "adversaries", "rezin", "against", and "enemies". It is saying that the verse draws attention to "jehovah" and "adversaries", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "The bricks are fallen down but we..." into verse 12's "the Syrians on the east and the...", so "jehovah" and "adversaries" 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 "jehovah" and "adversaries" with trust shaped by these words, not by a vague optimism outside the passage.