Psalms 138:8

The verse contains a statement and a prayer, and the prayer is for the thing the statement has just guaranteed. That is worth noticing, because it is how most honest faith actually sounds.

Yahweh will fulfill that which concerns me. Some translations render it: will perfect, or will complete, what concerns me. It is a confident sentence about unfinished business — a life still in progress, with loose ends, brought to completion by someone else.

Then: don't forsake the works of your own hands. He asks for exactly what he has just asserted. If you have ever prayed hard for something you also believe is promised, this verse has already made room for you. The asking is not evidence of doubt; the psalm holds both in one breath without apology.

And the argument in that last line is unusual. He does not appeal to his own faithfulness, or to his need, though both would be available. He appeals to God's investment. These are the works of your own hands. Do not abandon what you made.

It is the argument a craftsman would understand. You do not walk away from a half-finished piece because the work is not going well; the unfinishedness is a claim on you. David applies that to himself, and the boldness is remarkable: he is calling his own life God's project, and holding him to it.