Passage
For You are my lamp, O Yahweh; And Yahweh illumines my darkness.
For You are my lamp, O Yahweh; And Yahweh illumines my darkness.
2 Samuel 22:27 With the pure You show Yourself pure, And with the crooked You show Yourself astute.
2 Samuel 22:28 And You save an afflicted people; But Your eyes are on the haughty whom You bring down.
2 Samuel 22:29 For You are my lamp, O Yahweh; And Yahweh illumines my darkness.
2 Samuel 22:30 For by You I can run upon a troop; By my God I can leap over a wall.
2 Samuel 22:31 As for God, His way is blameless; The word of Yahweh is tried; He is a shield to all who take refuge in Him.
The verse centers on "darkness", "lamp", "yahweh", and "illumines". It is saying that the verse draws attention to "darkness" and "lamp", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 28's "And You save an afflicted people But..." into verse 30's "For by You I can run upon...", so "darkness" and "lamp" belong inside that flow. In 2 Samuel context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "darkness" and "lamp" with trust shaped by these words, not by a vague optimism outside the passage.