Asking God to Show His Vengeance

The psalmist cries out, "God of Vengeance, shine forth." Do we realize today that God is a God of Vengeance? Do we realize that He is willing to punish His enemies, if we call on Him to do so? Or have we succumbed to the idolatrous view of God, in which He is portrayed as a god of love only, and a sentimental love at that? We are to love our enemies and bless those who persecute us, but we can still pray that God bring about righteous judgment on His enemies.