Passage
Lord, now thou lettest thy bondman go, according to thy word, in peace;
Lord, now thou lettest thy bondman go, according to thy word, in peace;
Luke 2:27 And he came in the Spirit into the temple; and as the parents brought in the child Jesus that they might do for him according to the custom of the law,
Luke 2:28 *he* received him into his arms, and blessed God, and said,
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;
The verse centers on "lord", "thou", "lettest", "bondman", "word", and "peace". It is saying that the verse draws attention to "lord" and "thou", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 28's "he received him into his arms and..." into verse 30's "for mine eyes have seen thy salvation...", so "lord" and "thou" 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 "lord" and "thou" with trust shaped by these words, not by a vague optimism outside the passage.