38 “I will follow up mine enemies, and seize them”. I will follow up my carnal affections, and will not be seized by them, but will seize them, so that they may be consumed. “And I will not turn, till they fail.” And from this purpose I will not turn myself to rest, till they fail who make a tumult about me.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)