5 “Lest at any time mine enemy say, I have prevailed against him”. The devil's mockery is to be feared. “They that trouble me will exult, if I be moved;” the devil and his angels; who exulted not over that righteous man, Job, when they troubled him; because he was not moved, that is, did not draw back from the steadfastness of his faith.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)