Passage
For Thou--Thou hast possessed my reins, Thou dost cover me in my mother's belly.
For Thou--Thou hast possessed my reins, Thou dost cover me in my mother's belly.
Psalms 139:11 And I say, `Surely darkness bruiseth me, Then night <FI>is<Fi> light to me.
Psalms 139:12 Also darkness hideth not from Thee, And night as day shineth, as <FI>is<Fi> darkness so <FI>is<Fi> light.
Psalms 139:13 For Thou--Thou hast possessed my reins, Thou dost cover me in my mother's belly.
Psalms 139:14 I confess Thee, because that <FI>with<Fi> wonders I have been distinguished. Wonderful <FI>are<Fi> Thy works, And my soul is knowing <FI>it<Fi> well.
Psalms 139:15 My substance was not hid from Thee, When I was made in secret, Curiously wrought in the lower part of earth.
The verse centers on "thou--thou", "hast", "possessed", "reins", "dost", "cover", and "mother's". 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 12's "Also darkness hideth not from Thee And..." into verse 14's "I confess Thee because that FI with...", 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.