Grant not, O Lord, the desires of the wicked. The "desires of the wicked" are hurtful both to themselves and others. It is in his mercy that God does not grant them. Further not his wicked device; lest they exalt themselves.
So the LXX; μήποτε ὑψωθῶσιν. Others translate, "Or how they will exalt themselves!" The third stanza here terminates.