17 “If My people would have heard Me, if Israel would have walked in My ways”. For perchance that Israel says, Behold I sin, it is manifest, I go after the affections of my own heart: but what can I do? The devil does this. Demons do this. What is the devil? Who are the demons? Certainly your enemies. “Unto nothing all their enemies I would have brought down; and on them that oppress them I would have sent forth My hand”. But now what have they to do to complain of enemies? Themselves have become the worse enemies. For how? What follows? Of enemies ye complain, yourselves, what are you?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)