Nevertheless the dimness shall not be such as was in her vexation, when at the first he lightly afflicted the land of Zebulun and the land of Naphtali, and afterward did more grievously afflict her by the way of the sea, beyond Jordan, in Galilee of the nations.
Isaiah 9:1 Nevertheless the dimness shall not be such as was in her vexation, when at the first he lightly afflicted the land of Zebulun and the land of Naphtali, and afterward did more grievously afflict her by the way of the sea, beyond Jordan, in Galilee of the nations.
Isaiah 9:2 The people that walked in darkness have seen a great light: they that dwell in the land of the shadow of death, upon them hath the light shined.
Isaiah 9:3 Thou hast multiplied the nation, and not increased the joy: they joy before thee according to the joy in harvest, and as men rejoice when they divide the spoil.
The verse centers on "light", "nevertheless", "dimness", "shall", "such", "vexation", "first", and "lightly". It is saying that the verse draws attention to "light" and "nevertheless", so its meaning should be read from those terms before moving to application.
The next verse adds "The people that walked in darkness have...", so "light" and "nevertheless" should be read forward into that movement. 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 "light" and "nevertheless" with trust shaped by these words, not by a vague optimism outside the passage.