Passage
give them obduracy of heart, thy curse unto them;
give them obduracy of heart, thy curse unto them;
Lamentations 3:63 Behold thou their sitting down and their rising up: I am their song.
Lamentations 3:64 Render unto them a recompence, O Jehovah, according to the work of their hands;
Lamentations 3:65 give them obduracy of heart, thy curse unto them;
Lamentations 3:66 pursue them in anger, and destroy them from under the heavens of Jehovah.
The verse centers on "give", "obduracy", "heart", and "curse". It is saying that the verse draws attention to "give" and "obduracy", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 64's "Render unto them a recompence O Jehovah..." into verse 66's "pursue them in anger and destroy them...", so "give" and "obduracy" 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 "give" and "obduracy" with trust shaped by these words, not by a vague optimism outside the passage.