Passage
For thou wilt light my lamp: Jehovah my God will lighten my darkness.
For thou wilt light my lamp: Jehovah my God will lighten my darkness.
Psalms 18:26 With the pure thou wilt show thyself pure; And with the perverse thou wilt show thyself froward.
Psalms 18:27 For thou wilt save the afflicted people; But the haughty eyes thou wilt bring down.
Psalms 18:28 For thou wilt light my lamp: Jehovah my God will lighten my darkness.
Psalms 18:29 For by thee I run upon a troop; And by my God do I leap over a wall.
Psalms 18:30 As for God, his way is perfect: The word of Jehovah is tried; He is a shield unto all them that take refuge in him.
The verse centers on "light", "darkness", "thou", "wilt", "lamp", "jehovah", and "lighten". 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 thou wilt save the afflicted people..." into verse 29's "For by thee I run upon a...", 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.