Passage
The people who are walking in darkness Have seen a great light, Dwellers in a land of death-shade, Light hath shone upon them.
The people who are walking in darkness Have seen a great light, Dwellers in a land of death-shade, Light hath shone upon them.
Isaiah 9:1 As the former time made light The land of Zebulun and the land of Naphtali, So the latter hath honoured the way of the sea, Beyond the Jordan, Galilee of the nations.
Isaiah 9:2 The people who are walking in darkness Have seen a great light, Dwellers in a land of death-shade, Light hath shone upon them.
Isaiah 9:3 Thou hast multiplied the nation, Thou hast made great its joy, They have joyed before Thee as the joy in harvest, As <FI>men<Fi> rejoice in their apportioning spoil.
Isaiah 9:4 Because the yoke of its burden, And the staff of its shoulder, the rod of its exactor, Thou hast broken as <FI>in<Fi> the day of Midian.
The verse centers on "light", "darkness", "people", "walking", "seen", "great", "dwellers", and "land". It is saying that the contrast between light and darkness marks a real divide in how people respond to God's work.
The nearby context moves from verse 1's "As the former time made light The..." into verse 3's "Thou hast multiplied the nation Thou hast...", so "light" and "darkness" 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 "light" and "darkness" with trust shaped by these words, not by a vague optimism outside the passage.