Passage
Thou--Thou hast known my sitting down, And my rising up, Thou hast attended to my thoughts from afar.
Thou--Thou hast known my sitting down, And my rising up, Thou hast attended to my thoughts from afar.
Psalms 139:1 To the Overseer. --A Psalm by David. Jehovah, Thou hast searched me, and knowest.
Psalms 139:2 Thou--Thou hast known my sitting down, And my rising up, Thou hast attended to my thoughts from afar.
Psalms 139:3 My path and my couch Thou hast fanned, And <FI>with<Fi> all my ways hast been acquainted.
Psalms 139:4 For there is not a word in my tongue, Lo, O Jehovah, Thou hast known it all!
The verse centers on "thou--thou", "hast", "known", "sitting", "down", and "rising". It is saying that the verse draws attention to "thou--thou" and "hast", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 1's "To the Overseer A Psalm by David..." into verse 3's "My path and my couch Thou hast...", so "thou--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--thou" and "hast" with trust shaped by these words, not by a vague optimism outside the passage.