Passage
For it is thou that makest my lamp to shine: Jehovah my God enlighteneth my darkness.
For it is thou that makest my lamp to shine: Jehovah my God enlighteneth my darkness.
Psalms 18:26 With the pure thou dost shew thyself pure; and with the perverse thou dost shew thyself contrary.
Psalms 18:27 For it is thou that savest the afflicted people; but the haughty eyes wilt thou bring down.
Psalms 18:28 For it is thou that makest my lamp to shine: Jehovah my God enlighteneth my darkness.
Psalms 18:29 For by thee I have run through a troop; and by my God have I leaped over a wall.
Psalms 18:30 As for God, his way is perfect; the word of Jehovah is tried: he is a shield to all that trust in him.
The verse centers on "light", "darkness", "thou", "makest", "lamp", "shine", "jehovah", and "enlighteneth". 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 27's "For it is thou that savest the..." into verse 29's "For by thee I have run through...", so "light" and "darkness" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
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.