Passage
Thou hast proved my heart, and visited it by night, thou hast tried me by fire: and iniquity hath not been found in me.
Thou hast proved my heart, and visited it by night, thou hast tried me by fire: and iniquity hath not been found in me.
Psalms 16:1 The prayer of David. Hear, O Lord, my justice: attend to my supplication. Give ear unto my prayer, which proceedeth not from deceitful lips.
Psalms 16:2 Let my judgment come forth from thy countenance: let thy eyes behold the things that are equitable.
Psalms 16:3 Thou hast proved my heart, and visited it by night, thou hast tried me by fire: and iniquity hath not been found in me.
Psalms 16:4 That my mouth may not speak the works of men: for the sake of the words of thy lips, I have kept hard ways.
Psalms 16:5 Perfect thou my goings in thy paths: that my footsteps be not moved.
The verse centers on "thou", "hast", "proved", "heart", "visited", and "night". It is saying that the verse draws attention to "thou" and "hast", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 2's "Let my judgment come forth from thy..." into verse 4's "That my mouth may not speak the...", so "thou" and "hast" 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 "thou" and "hast" with trust shaped by these words, not by a vague optimism outside the passage.