13 “Deliver My soul from the ungodly.” Deliver My soul, by restoring Me after the death, which the ungodly have inflicted on Me. “Your weapon: from the enemies of Your hand”. For My soul is Your weapon, which Your hand, that is, Your eternal Power, has taken to subdue thereby the kingdoms of iniquity, and divide the righteous from the ungodly. This weapon then “deliver from the enemies of Your hand,” that is, of Your Power, that is, from Mine enemies. “Destroy them, O Lord, from off the earth, scatter them in their life.” O Lord, destroy them from off the earth, which they inhabit, scatter them throughout the world in this life, which only they think their life, who despair of life eternal. “And by Your hidden things their belly has been filled.” Now not only this visible punishment shall overtake them, but also their memory has been filled with sins, which as darkness are hidden from the light of Your truth, that they should forget God. “They have been filled with swine's flesh.” They have been filled with uncleanness, treading under foot the pearls of God's words. “And they have left the rest to their babes:” crying out, “This sin be upon us and upon our children.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)