Passage
which thou hast prepared before the face of all peoples;
which thou hast prepared before the face of all peoples;
Luke 2:29 Lord, now thou lettest thy bondman go, according to thy word, in peace;
Luke 2:30 for mine eyes have seen thy salvation,
Luke 2:31 which thou hast prepared before the face of all peoples;
Luke 2:32 a light for revelation of [the] Gentiles and [the] glory of thy people Israel.
Luke 2:33 And his father and mother wondered at the things which were said concerning him.
The verse centers on "thou", "hast", "prepared", "before", "face", and "peoples". 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 30's "for mine eyes have seen thy salvation..." into verse 32's "a light for revelation of the Gentiles...", so "thou" and "hast" belong inside that flow. In Luke context, the local focus is Christ, faith, and discipleship.
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.