The Book of PsalmsPsalm 12
Usquequo, Domine. A prayer in tribulation.
The Douay-Rheims numbers the Psalms as the Latin Vulgate does. In Bibles translated from the Hebrew this is Psalm 13. Read Psalm 13 in the WEBC.

12Unto the end, a psalm for David. How long, O Lord, wilt thou forget me unto the end? how long dost thou turn away thy face from me?
2How long shall I take counsels in my soul, sorrow in my heart all the day?
3How long shall my enemy be exalted over me?
4Consider, and hear me, O Lord my God. Enlighten my eyes that I never sleep in death:
5Lest at any time my enemy say: I have prevailed against him. They that trouble me will rejoice when I am moved:
6But I have trusted in thy mercy. My heart shall rejoice in thy salvation: I will sing to the Lord, who giveth me good things: yea I will sing to the name of the Lord the most high.