The beginning and the end of Psalm 6 are built to match. Each runs three verses, six lines, twenty-four words — the same length to the word — and the echoes between them are deliberate.

The opening is a man coming apart. “Have mercy, YHWH… heal me, YHWH.” He is “very dismayed,” and he asks the ancient question of the desperate: how long? No answer comes.

The closing reuses the pieces and turns each one over. The mercy he begged for has arrived — YHWH has heard his plea, heard his prayer. The dismay that shook him is still in the poem, but it has changed owners: now it is his enemies who are “very dismayed.” And the unanswered “how long?” finally gets its answer, the shortest possible one. To a man who has been asking how long he must wait, the reply lands like a door slamming shut: in a moment.

Nothing in his situation is described as slowly improving. The poem simply sets the ending beside the beginning, the same words in the same order, and lets you see the whole thing has turned over — the tears at one end, the routed enemies at the other, and between them the single instant it took. David’s entire situation has been overturned. 

Read more on psalms.scriptura.org → https://psalms.scriptura.org/w/Psalm_6/Poetry