Passage
As for God, his way is perfect; the word of the LORD is tried: he is a buckler to all them that trust in him.
2 Samuel 22:31 (KJV)
Nearby Context
2 Samuel 22:29 For thou art my lamp, O LORD: and the LORD will lighten my darkness.
2 Samuel 22:30 For by thee I have run through a troop: by my God have I leaped over a wall.
2 Samuel 22:31 As for God, his way is perfect; the word of the LORD is tried: he is a buckler to all them that trust in him.
2 Samuel 22:32 For who is God, save the LORD? and who is a rock, save our God?
2 Samuel 22:33 God is my strength and power: and he maketh my way perfect.
Study Lenses
The verse centers on "perfect", "word", "lord", "tried", "buckler", and "trust". It is saying that the verse draws attention to "perfect" and "word", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 30's "For by thee I have run through..." into verse 32's "For who is God save the LORD...", so "perfect" and "word" 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 "perfect" and "word" with trust shaped by these words, not by a vague optimism outside the passage.