Passage
Thou hast covered thyself with a cloud, that prayer should not pass through.
Thou hast covered thyself with a cloud, that prayer should not pass through.
Lamentations 3:42 We have transgressed and have rebelled: thou hast not pardoned.
Lamentations 3:43 Thou hast covered thyself with anger, and pursued us; thou hast slain, thou hast not spared.
Lamentations 3:44 Thou hast covered thyself with a cloud, that prayer should not pass through.
Lamentations 3:45 Thou hast made us the offscouring and refuse in the midst of the peoples.
Lamentations 3:46 All our enemies have opened their mouth against us.
The verse centers on "thou", "hast", "covered", "thyself", "cloud", "prayer", "should", and "pass". 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 43's "Thou hast covered thyself with anger and..." into verse 45's "Thou hast made us the offscouring and...", so "thou" and "hast" belong inside that flow. In Lamentations context, the local focus is covenant, worship, and faithfulness.
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.